Читать книгу A Candid Examination of Theism - George John Romanes - Страница 22

§ 8. Leaving now the obviously untenable arguments, we next come to those which, in my opinion, may properly be termed scientific.

It will be convenient to classify those as three in number; and under one or other of these heads nearly all the more intelligent advocates of Theism will be found to range themselves.

§ 9. We have first the argument drawn from the existence of the human mind. This is an argument which, for at least the last three centuries, and especially during the present one, has been more relied upon than any other by philosophical thinkers. It consists in the reflection that the being of our own subjective intelligence is the most certain fact which our experience supplies, that this fact demands an adequate cause for its explanation, and that the only adequate cause of our intelligence must be some other intelligence. Granting the existence of a conditioned intelligence (and no one could reasonably suppose his own intelligence to be otherwise), and the existence of an unconditioned intelligence becomes a logical necessity, unless we deny either the validity of the principle that every effect must have an adequate cause, or else that the only adequate cause of Mind is Mind.

It has been a great satisfaction to me to find that my examination of this argument—an examination which was undertaken and completed several months before Mr. Mill's essay appeared—has been minutely corroborated by that of our great logician. I mention this circumstance here, as on previous occasions, not for the petty motive of vindicating my own originality, but because in matters of this kind the accuracy of the reasoning employed, and therefore the logical validity of the conclusions attained, are guaranteed in the best possible manner, if the trains of thought have been independently pursued by different minds.

§ 10. Seeing that, among the advocates of this argument, Locke went so far as to maintain that by it alone he could render the existence of a Deity as certain as any mathematical demonstration, it is only fair, preparatory to our examining this argument, to present it in the words of this great thinker.

He says:—"There was a time when there was no knowing (i.e., conscious) being, and when knowledge began to be; or else there has been also a knowing being from all eternity. If it be said, there was a time when no being had any knowledge, when that eternal being was void of all understanding, I reply, that then it was impossible there should ever have been any knowledge: it being as impossible that things wholly void of knowledge, and operating blindly, and without perception, should produce a knowing being, as it is impossible that a triangle should make itself three angles bigger than two right ones. For it is as repugnant to the idea of senseless matter, that it should put into itself, sense, perception, and knowledge, as it is repugnant to the idea of a triangle, that it should put into itself greater angles than two right ones."^[4]

Now, although this argument has been more fully elaborated by other writers, the above presentation contains its whole essence. It will be seen that it has the great advantage of resting immediately upon the foundation from which all argument concerning this or any other matter, must necessarily arise, viz.—upon the very existence of our argumentative faculty itself. For the sake of a critical examination, it is desirable to throw the argument before us into the syllogistic form. It will then stand thus:—

All known minds are caused by an unknown mind. Our mind is a known mind; therefore, our mind is caused by an unknown mind.

§ 11. Now the major premiss of this syllogism is inadmissible for two reasons: in the first place, it is assumed that known mind can only be caused by unknown mind; and, in the second place, even if this assumption were granted, it would not explain the existence of Mind as Mind. To take the last of these objections first, in the words of Mr. Mill, "If the mere existence of Mind is supposed to require, as a necessary antecedent, another Mind greater and more powerful, the difficulty is not removed by going one step back: the creating mind stands as much in need of another mind to be the source of its existence as the created mind. Be it remembered that we have no direct knowledge (at least apart from Revelation) of a mind which is even apparently eternal, as Force and Matter are: an eternal mind is, as far as the present argument is concerned, a simple hypothesis to account for the minds which we know to exist. Now it is essential to an hypothesis that, if admitted, it should at least remove the difficulty and account for the facts. But it does not account for mind to refer our mind to a prior mind for its origin. The problem remains unsolved, nay, rather increased."

Nevertheless, I think that it is open to a Theist to answer, "My object is not to explain the existence of Mind in the abstract, any more than it is my object to explain Existence itself in the abstract—to either of which absurd attempts Mr. Mill's reasoning would be equally applicable;—but I seek for an explanation of my own individual finite mind, which I know to have had a beginning in time, and which, therefore, in accordance with the widest and most complete analogy that experience supplies, I believe to have been caused. And if there is no other objection to my believing in Intelligence as the cause of my intelligence, than that I cannot prove my own intelligence caused, then I am satisfied to let the matter rest here; for as every argument must have some basis of assumption to stand upon, I am well pleased to find that the basis in this case is the most solid which experience can supply, viz.—the law of causation. Fully admitting that it does not account for Mind (in the abstract) to refer one mind to a prior mind for its origin; yet my hypothesis, if admitted, does account for the fact that my mind exists; and this is all that my hypothesis is intended to cover. For to endeavour to explain the existence of an eternal mind, could only be done by those who do not understand the meaning of these words."

Now, I think that this reply to Mr. Mill, on the part of a theist, would so far be legitimate; the theistic hypothesis does supply a provisional explanation of the existence of known minds, and it is, therefore, an explanation which, in lieu of a better, a theist may be allowed to retain. But a theist may not be allowed to confuse this provisional explanation of his own mind's existence with that of the existence of Mind in the abstract; he must not be allowed to suppose that, by thus hypothetically explaining the existence of known minds, he is thereby establishing a probability in favour of that hypothetical cause, an Unknown Mind. Only if he has some independent reason to infer that such an Unknown Mind exists, could such a probability be made out, and his hypothetical explanation of known mind become of more value than a guess. In other words, although the theistic hypothesis supplies a possible explanation of known mind, we have no reason to conclude that it is the true explanation, unless other reasons can be shown to justify, on independent grounds, the validity of the theistic hypothesis. Hence it is manifestly absurd to adduce this explanation as evidence of the hypothesis on which it rests—to argue that Theism must therefore be true; because we assume it to be so, in order to explain known mind, as distinguished from Mind. If it be answered, We are justified in assuming Theism true, because we are justified in assuming that known mind can only have been caused by an unknown mind, and hence that Mind must somewhere be self-existing, then this is to lead us to the second objection to the above syllogism.

§ 12. And this second objection is of a most serious nature. "Mind can only be caused by Mind," and, therefore, Mind must either be uncaused, or caused by a Mind. What is our warrant for ranking this assertion? Where is the proof that nothing can have caused a mind except another mind? Answer to this question there is none. For aught that we can ever know to the contrary, anything within the whole range of the Possible may be competent to produce a self-conscious intelligence—and to assume that Mind is so far an entity sui generis, that it must either be self-existing, or derived from another mind which is self-existing, is merely to beg the whole question as to the being of a God. In other words, if we can prove that the order of existence to which Mind belongs, is so essentially different from that order, or those orders, to which all else belongs, as to render it abstractedly impossible that the latter can produce the former—if we can prove this, we have likewise proved the existence of a Deity. But this is just the point in dispute, and to set out with a bare affirmation of it is merely to beg the question and to abandon the discussion. Doubtless, by the mere act of consulting their own consciousness, the fact now in dispute appears to some persons self-evident. But in matters of such high abstraction as this, even the evidence of self-evidence must not be relied upon too implicitly. To the country boor it appears self-evident that wood is annihilated by combustion; and even to the mind of the greatest philosophers of antiquity it seemed impossible to doubt that the sun moved over a stationary earth. Much more, therefore, may our broad distinction between "cogitative and incogitative being"^[5] not be a distinction which is "legitimated by the conditions of external reality."

Doubtless many will fall back upon the position already indicated, "It is as repugnant to the idea of senseless matter, that it should put into itself sense, perception, and knowledge, as it is repugnant to the idea of a triangle, that it should put into itself greater angles than two right ones." But, granting this, and also that conscious matter is the sole alternative, and what follows? Not surely that matter cannot perceive, and feel, and know, merely because it is repugnant to our idea of it that it should. Granting that there is no other alternative in the whole possibility of things, than that matter must be conscious, or that self-conscious Mind must somewhere be self-existing; and granting that it is quite "impossible for us to conceive" of consciousness as an attribute of matter; still surely it would be a prodigious leap to conclude that for this reason matter cannot possess this attribute. Indeed, Locke himself elsewhere strangely enough insists that thought may be a property of matter, if only the Deity chose to unite that attribute with that substance. Why it should be deemed abstractedly impossible for matter to think if there is no God, and yet abstractedly possible that it should think if there is a God, I confess myself quite unable to determine; but I conceive that it is very important clearly to point out this peculiarity in Locke's views, for he is a favourite authority with theists, and this peculiarity amounts to nothing less than a suicide of his entire argument. The mere circumstance that he assumed the Deity capable of endowing matter with the faculty of thinking, could not have enabled him to conceive of matter as thinking, any more than he could conceive of this in the absence of his assumption. Yet in the one case he recognises the possibility of matter thinking, and in the other case denies such possibility, and this on the sole ground of its being inconceivable! However, I am not here concerned with Locke's eccentricities:^[6] I am merely engaged with the general principle, that a subjective inability to establish certain relations in thought is no sufficient warrant for concluding that corresponding objective relations may not obtain.

§ 13. Hence, an objector to the above syllogism need not be a materialist; it is not even necessary that he should hold any theory of things at all. Nevertheless, for the sake of definition, I shall assume that he is a materialist. As a materialist, then, he would appear to be as much entitled to his hypothesis as a theist is to his—in respect, I mean, of this particular argument. For although I think, as before shown, that in strict reasoning a theist might have taken exception to the last-quoted passage from Mill in its connection with the law of causation, that passage, if considered in the present connection, is certainly unanswerable. What is the state of the present argument as between a materialist and a theist? The mystery of existence and the inconceivability of matter thinking are their common data. Upon these data the materialist, justly arguing that he has no right to make his own conceptive faculty the unconditional test of objective possibility, is content to merge the mystery of his own mind's existence into that of Existence in general; while the theist, compelled to accept without explanation the mystery of Existence in general, nevertheless has recourse to inventing a wholly gratuitous hypothesis to explain one mode of existence in particular. If it is said that the latter hypothesis has the merit of causing the mystery of material existence and the mystery of mental existence to be united in a thinkable manner—viz., in a self-existing Mind—I reply, It is not so; for in whatever degree it is unthinkable that Matter should be the cause of Mind, in that precise degree must it be unthinkable that Mind was ever the cause of Matter, the correlatives being in each case the same, and experience affording no evidence of causality in either.

§ 14. The two hypotheses, therefore, are of exactly equivalent value, save that while the one has a certain basis of fact to rest upon,^[7] the other is wholly arbitrary. But it may still be retorted, 'Is not that which is most conceivable most likely to be true? and if it is more conceivable that my intelligence is caused by another Intelligence than that it is caused by Non-intelligence, may I not regard the more conceivable hypothesis as also the more probable one? It is somewhat difficult to say how far this argument is, in this case, valid; only I think it is quite evident that its validity is open to grave dispute. For nothing can be more evident to a philosophical thinker than that the substance of Mind must—so far at least as we can at present see—necessarily be unknowable; so that if Matter (and Force) be this substance, we should antecedently expect to find that the actual causal connection should, in this particular case, be more inconceivable than some imaginary one: it would be more natural for the mind to infer that something conceivably more akin to itself should be its cause, than that this cause should be the entity which really gives rise to the unthinkable connection. But even waiving this reflection, and granting that the above argument is valid, it is still to an indefinite degree valueless, seeing that we are unable to tell how much it is more likely that the more conceivable should here be true than that the less conceivable should be so.

§ 15. Returning then to Locke's comparison between the certainty of this argument and that which proves the sum of the angles of a triangle to be equal to two right-angles, I should say that there is a virtual, though not a formal, fallacy in his presentation. For mathematical science being confessedly but of relative significance, any comparison between the degree of certainty attained by reasoning upon so transcendental a subject as the present, and that of mathematical demonstrations regarding relative truth, must be misleading. In the present instance, the whole strain of the argument comes upon the adequacy of the proposed test of truth, viz., our being able to conceive it if true. Now, will any one undertake to say that this test of truth is of equivalent value when it is applied to a triangle and when it is applied to the Deity. In the one case we are dealing with a geometrical figure of an exceedingly simple type, with which our experience is well acquainted, and presenting a very limited number of relations for us to contemplate. In the other case we are endeavouring to deal with the summum genus of all mystery, with reference to which experience is quite impossible, and which in its mention contains all the relations that are to us unknown and unknowable. Here, then, is the oversight. Because men find conceivability a valid test of truth in the affairs of everyday life—as it is easy to show à priori that it must be, if our experience has been formed under a given code of constant and general laws—therefore they conclude that it must be equally valid wherever it is applied; forgetting that its validity must perforce decrease in proportion to the distance at which the test is applied from the sphere of experience.^[8]

§ 16. Upon the whole, then, I think it is transparently obvious that the mere fact of our being unable to conceive, say, how any disposition of matter and motion could possibly give rise to a self-conscious intelligence, in no wise warrants us in concluding that for this reason no such disposition is possible. The only question would appear to be, whether the test which is here proposed as an unconditional criterion of truth should be allowed any the smallest degree of credit. Seeing, on the one hand, how very fallible the test in question is known to have proved itself in many cases of much less speculative difficulty—seeing, too, that even now "the philosophy of the condition proves that things there are which may, nay must, be true, of which nevertheless the mind is unable to construe to itself the possibility;"^[9] and seeing, on the other hand, that the substance of Mind, whatever it is, must necessarily be unknowable;—seeing these things, if any question remains as to whether the test of inconceivability should in this case be regarded as having any degree of validity at all, there can, I think, be no reasonable doubt that such degree should be regarded as of the smallest.

§ 17. Let us then turn to the other considerations which have been supposed to justify the assertion that nothing can have caused our mind save another Mind. Neglecting the crushing fact that "it does not account for Mind to refer it to another Mind for its origin," let as see what positive reasons there are for concluding that no other influence than Intelligence can possibly have produced our intelligence.

§ 18. First we may notice the argument which is well and tersely presented by Locke, thus:—"Whatsoever is first of all things must necessarily contain in it, and actually have, at least, all the perfections that can ever after exist; nor can it ever give to another any perfection that it hath not actually in itself, or at least in a higher degree; it necessarily follows that the first eternal being cannot be Matter." Now, as this presentation is strictly formal, I shall first meet it with a formal reply, and this reply consists in a direct contradiction. It is simply untrue that "whatsoever is first of all things must necessarily contain in it, and actually have, at least, all the perfections that can after exist;" or that it can never "give to another any perfection that it hath not actually in itself." In a sense, no doubt, a cause contains all that is contained in its effects; the latter content being potentially present in the former. But to say that a cause already contains actually all that its effects may afterwards so contain, is a statement which logic and common sense alike condemn as absurd.

Nevertheless, although the argument now before us thus admits of a childishly easy refutation on strictly formal grounds, I suspect that in substance the argument in a general way is often relied upon as one of very considerable weight. Even though it is clearly illogical to say that causes cannot give to their effects any perfection which they themselves do not actually present, yet it seems in a general way incredible that gross matter could contain, even potentially, the faculty of thinking. Nevertheless, this is but to appeal to the argument from Inconceivability; to do which, even were it here legitimate, would, as we have seen, be unavailing. But to appeal to the argument from Inconceivability in this case would not be legitimate; for we are in possession of an abundant analogy to render the supposition in question, not only conceivable, but credible. In the words of Mr. Mill, "Apart from experience, and arguing on what is called reason, that is, on supposed self-evidence, the notion seems to be that no causes can give rise to products of a more precious or elevated kind than themselves. But this is at variance with the known analogies of nature. How vastly nobler and more precious, for instance, are the vegetables and animals than the soil and manure out of which, and by the properties of which, they are raised up! The tendency of all recent speculation is towards the opinion that the development of inferior orders of existence into superior, the substitution of greater elaboration, and higher organisation for lower, is the general rule of nature. Whether this is so or not, there are at least in nature a multitude of facts bearing that character, and this is sufficient for the argument."

§ 19. We now come to the last of the arguments which, so far as I know, have ever been adduced in support of the assertion that there can be no other cause of our intelligence than another and superior Intelligence. The argument is chiefly remarkable for the very great prominence which was given to it by Sir W. Hamilton.

This learned and able author says:—"The Deity is not an object of immediate contemplation; as existing and in himself, he is beyond our reach; we can know him only mediately through his works, and are only warranted in assuming his existence as a certain kind of cause necessary to account for a certain state of things, of whose reality our faculties are supposed to inform us. The affirmation of a God being thus a regressive inference from the existence of a special class of effects to the existence of a special character of cause, it is evident that the whole argument hinges on the fact—Does a state of things really exist such as is only possible through the agency of a Divine Cause? For if it can be shown that such a state of things does not really exist, then our inference to the kind of cause requisite to account for it is necessarily null.

"This being understood, I now proceed to show you that the class of phænomena which requires that kind of cause we denominate a Deity is exclusively given in the phænomena of mind—that the phænomena of matter taken by themselves, (you will observe the qualification taken by themselves) so far from warranting any inference to the existence of a God, would, on the contrary, ground even an argument to his negation.

"If, in man, intelligence be a free power—in so far as its liberty extends, intelligence must be independent of necessity and matter; and a power independent of matter necessarily implies the existence of an immaterial subject—that is, a spirit. If, then, the original independence of intelligence on matter in the human constitution, in other words, if the spirituality of mind in man be supposed a datum of observation, in this datum is also given both the condition and the proof of a God. For we have only to infer, what analogy entitles us to do, that intelligence holds the same relative supremacy in the universe which it holds in us, and the first positive condition of a Deity is established in the establishment of the absolute priority of a free creative intelligence."^[10]

§ 20. Thus, according to Sir W. Hamilton, the whole question as to the being of a God depends upon that as to whether our "intelligence be a free power,"—or, as he elsewhere states it himself, "Theology is wholly dependent upon Psychology, for with the proof of the moral nature of man stands or falls the proof of the existence of a Deity." It will be observed that I am not at present engaged with the legitimacy of this author's decision upon the comparative merits of the different arguments in favour of Theism: I am merely showing the high opinion he entertained of the particular argument before us. He positively affirms that, unless the freedom of the human will be a matter of experience, Atheism is the sole alternative. Doubtless most well-informed readers will feel that the solitary basis thus provided for Theism is a very insecure one, while many such readers will at once conclude that if this is the only basis which reason can provide for Theism to stand upon, Theism is without any rational basis to stand upon at all. I have no hesitation in saying that the last-mentioned opinion is the one to which I myself subscribe, for I am quite unable to understand how any one at the present day, and with the most moderate powers of abstract thinking, can possibly bring himself to embrace the theory of Free-will. I may add that I cannot but believe that those who do embrace this theory with an honest conviction, must have failed to understand the issue to which modern thought has reduced the question. Here, however, is not the place to discuss this question. It will be sufficient for my purpose to show that even Sir W. Hamilton himself considered it a very difficult one; and although he thought upon the whole that the will must be free, he nevertheless allowed—nay, insisted—that he was unable to conceive how it could be so. Such inability in itself does not of course show the Free-will theory to be untrue; and I merely point out the circumstance that Hamilton allowed the supposed fact unthinkable, in order to show how very precarious, even in his eyes, the argument which we are considering must have appeared. Let us then, for this purpose, contemplate his attitude with regard to it a little more closely. He says, "It would have been better to show articulately that Liberty and Necessity are both incomprehensible, as beyond the limits of legitimate thought; but that though the Free-agency of Man cannot be speculatively proved, so neither can it be speculatively disproved; while we may claim for it as a fact of real actuality, though of inconceivable possibility, the testimony of consciousness, that we are morally free, as we are morally accountable for our actions. In this manner the whole question of free- and bond-will is in theory abolished, leaving, however, practically our Liberty, and all the moral instincts of Man entire."^[11]

From this passage it is clear that Sir W. Hamilton regarded these two counter-theories as of precisely equivalent value in everything save "the testimony of consciousness;" or, as he elsewhere states it, "as equally unthinkable, the two counter, the two one-sided, schemes are thus theoretically balanced. But, practically, our consciousness of the moral law … gives a decisive preponderance to the doctrine of freedom over the doctrine of fate."

But the whole question concerning the freedom of the will has now come to be as to whether or not consciousness does give its verdict on the side of freedom. Supposing we grant that "we are warranted to rely on a deliverance of consciousness, when that deliverance is that a thing is, although we may be unable to think how it can be,"^[12] in this case the question still remains, whether our opponents have rightly interpreted the deliverance of their consciousness. I, for one, am quite persuaded that I never perform any action without some appropriate motive, or set of motives, having induced me to perform it. However, I am not discussing this question, and I have merely made the above quotations for the purpose of showing that Sir W. Hamilton appears to identify the theory of Free-will with the fact that we possess a moral sense. He argues throughout as though the theory he advocates were the only one that can explain a given "fact of real actuality." But no one with whom we have to deal questions the fact of our having a moral sense; and to identify this "deliverance of consciousness" with belief in the theory that volitions are uncaused, is, or would now be, merely to abandon the only questions in dispute.