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Preface

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The present book is the concluding part of a trilogy that began with Why the World Does Not Exist and continued with I am Not a Brain. Yet I have written it so that it can be understood without any acquaintance with its two predecessors. All three books have the same intended audience: anyone who likes to engage in philosophical thinking. And it is precisely this phenomenon, thinking, that is my topic in this book. Over the course of the following pages I will develop a theory of (human) thought that anyone should be able to understand.

Thought is perhaps the central concept of philosophy. Ever since Plato and Aristotle, philosophy has been understood as a science that thinks about thinking. Thinking about thinking is the origin of logic. Logic, in turn, is one of the foundations of our digital civilization, as, were it not for advances in philosophical logic in the nineteenth century, computer science would never have developed. In this regard, George Boole (1815–1864) and Gottlob Frege (1848–1925) were especially influential. Both were mathematicians, logicians and philosophers, and both set out a theory of thought which they used as the basis for developing the first systems of symbolic logic, the systems which underlie contemporary computer science. They thus did much to prepare the way for the digital revolution of our own day.

You are about to read a philosophical book free from opaque technical jargon. To follow the central arguments, there is no need to have worked your way through the technical aspects of logic. The main thesis I am going to advance is that human thought is a sense organ. Thinking is aesthetic (in the best case, something pleasurable) and not an exercise of force, discipline, punishment or blind, creativity-stifling rule-following. On the contrary: philosophical thought is a creative process, which is why philosophers such as the Romantics or Friedrich Nietzsche even went so far as to (try to) push it into the same camp as poetry.

Yet philosophy is ultimately neither quite like mathematics nor quite like poetry (or indeed any other art form). It borders on both domains, forming a point of intersection between the two.

Philosophy is the most general way of thinking about our thinking. It is more general still than mathematics, which is itself a form of language and thought that serves as a foundation for the natural sciences and technology. However, while not utterly unrelated to them, mathematics doesn’t give us the foundation of poetry, painting, religion, music or philosophy. What unites all of these highly sophisticated human phenomena is our sense of thought, and the structure and nature of this sense are the object (and subject) of philosophy. For philosophy is thought thinking itself.

At the same time, philosophy is much closer to the concrete phenomena of our everyday lives than many believe. It wants to get to the bottom of our experience and perception. It is not just in the business of building models that help us better predict and steer the anonymous course of nature or the behaviour of living beings such as ourselves; rather, it aims at wisdom. And, ultimately, the love of wisdom requires a more precise knowledge of all those fields of reality that we don’t (yet) know about. This is why Socrates understood philosophy as knowledge of our ignorance, without which wisdom is unattainable.

Thought is the interface between natural and psychological reality. To this extent, it ties together the topics of the previous two books of this trilogy: the world (which doesn’t really exist) and the self (which is not identical with the brain). In part, thinking means establishing and recognizing connections. In thought, we link together widely disparate realities and manufacture new ones.

Thinking is not some ethereal process floating far above reality, finding its home solely in the ivory tower. This is why philosophy shouldn’t be reduced to an academic parlour game, in which professional philosophers take competing positions on intimidatingly technical arguments with the aid of high-spec analytic tools. In the logic lectures he gave at the University of Königsberg, no less a thinker than Immanuel Kant distinguished between a ‘scholastic concept’ and a ‘worldly concept’ of philosophy.1 The scholastic concept is systematic theory construction, the craft practised and handed down in philosophy departments, institutes and seminars. It addresses the architecture of those fundamental concepts without which we could not grasp our own rationality. Kant gave this process the same name as his famous book: he called it a Critique of Pure Reason.

By contrast, the worldly concept is concerned with the ‘final ends of human reason’,2 which ultimately includes the question of what or who the human being is. And it therefore also has to ask what exactly our human capacity for thinking consists in. Are we merely an insignificant part of nature? Perhaps an especially clever animal? Perhaps even an animal blinded by its own intelligence? Or is the human being a privileged witness to a non-sensory, immaterial reality?

This high concept gives philosophy dignity, i.e. an absolute worth. And actually it is philosophy, too, which alone has only inner worth, and which first gives a worth to all other cognitions.3

All of the great philosophers – to name a few at random: Laozi, Plato, Aristotle, Immanuel Kant, Georg Wilhelm Friedrich Hegel, Friedrich Nietzsche, Jean-Paul Sartre, Edith Stein and Judith Butler – have inscribed themselves in our cultural memory through their contributions to the worldly concept of philosophy. We do not possess a single academic treatise by Plato. Yet, in his surviving dialogues, we find some of the deepest philosophical thoughts ever to be articulated, all in the simple language of everyday conversations.

In recent decades, Germany (not to mention other places that are yet to develop a public philosophical culture) has unfortunately witnessed a partial deterioration in its culture of public philosophical debate. One of the theses I want to advance here is that naturalism bears the chief responsibility for this decline. Naturalism is the view that all genuine knowledge and progress can be reduced to a combination of natural science and technological mastery of the survival conditions of human beings. Yet this is a fundamental error, a dangerous delusion, which haunts us in the form of various ideological crises: in the return of religion (which frankly never really went away) as an explanatory model in the grand style; in the demagogic seductions of so-called populists, who invoke lost national identities (which never actually existed); and in the crises of the public sphere that have arisen through the defining medium of the internet. Naturalism is incapable of addressing these urgent topics: starting from a misguided conception of the human mind, it cannot even understand the appeal of religion or the power of human rhetoric. Without new efforts of philosophical thought, our intellectual negotiation of all these crises will come up short. Without ethical reflection, advances in natural science and technology do not lead automatically to the improvement of human life. Rather, unbridled progress is currently destroying our planet, and this ought to be an impetus to reflection and a change of course. We should not forget that, over the last two hundred years, philosophically uninformed naturalism and its unjustified belief in pure scientific and technological progress have led to weapons of mass destruction as well as to actual mass destruction.

Today, as in all ages in which our species has graced the Earth, the human being itself is at stake, and, with it – due to the sheer technological power it wields – the continued existence of life on our planet. Philosophy can only face up to this challenge by developing new tools and thought models, with the help of which we can come to a greater knowledge of reality. Today, philosophy is a form of resistance against the lie of a ‘post-truth’ age. For philosophy is opposed to the senseless assertion of alternative facts, to conspiracy theories and ungrounded apocalyptic scenarios, lest all these get out of control and the not too distant future does in fact witness the end of humanity.

I will therefore be arguing in what follows for a contemporary, enlightened humanism – a humanism that defends the intellectual and ethical capacities of the human being against our post- and trans-humanist despisers.

A chief aim of this trilogy is to introduce the fundamental theoretical commitments of New Realism to an audience beyond the walls of the academy. New Realism is my proposal for overcoming the basic intellectual errors to which we continue to succumb, much to the harm of our society and our own humanity. A particularly insidious member of this set is the rampant ‘fear of truth’, to quote Hegel, that characterizes our age, or the ‘fear of knowledge’ that the American philosopher Paul Boghossian (b. 1957) diagnosed in his own critique of the errors underlying postmodernity. Among these are the conceits that there is no truth, no objective facts or objective reality.4

As I said, I will not be presupposing any knowledge of the previous two books of the trilogy. Each of these can be read as a more or less stand-alone work. In the few places where it might be necessary, though, I will repeat some of the ideas introduced in the previous books so that the reader has a fully adequate picture of the overall intellectual terrain being covered.

The principal function of philosophical books is to provoke the reader to think for herself. What we can learn from philosophy is how to get in view and then reflect upon our prejudices and unspoken assumptions concerning the essential questions of humanity, such as What or who are we as human beings really? What distinguishes us from other animals? Or: Can computers think?

At the end of the day, it isn’t so important whether I can convince you of my own positions. What matters is nothing but the truth. And since it’s not so easy to ascertain the truth purely through the self-exploration of human thought, there will always be differences of philosophical opinion. Believing that we could somehow answer our questions once and for all would therefore amount to a fundamental error. Instead, the crucial thing is to set our thinking in motion, so that we can open up new forms and fields of thought.

As we’ll see in due course, I take it to be a decisive criterion of reality that we can get it wrong. And because thought itself is something real, we’re not somehow immune from error when we tackle the question of what exactly it is. Thinking about thinking is no easier or less likely to lead to mistakes than thinking about any other part of reality. Though, needless to say, I’m fairly convinced that my own answer is correct, else I would hardly bother to set it out here.

To unravel the meaning of thought, I will introduce you to the notion that there is an actual sense of thought. The key thesis of the book says that our thought is a sense, just like sight, taste, hearing, feeling or touch. Through thinking, we touch a reality accessible only to thought, just as colours are usually accessible only to sight and sounds to hearing. At the same time, I argue the case for giving our thought a new meaning, in the sense of a new direction. I want to provide orientation in an age in which – as in all ages before it – we find our thinking thrown into confusion by a multitude of ideological currents and their propagandists. Just think of the thoughts you’ve recently had about Donald Trump! Was it really sensible to have had all of these? Isn’t it precisely one of the traps laid by Trump’s savvy media strategy that we spend so much time talking about the ever-swelling tide of scandals that engulf him?

As inhabitants of the infosphere – our digital environment – we are exposed to a relentless flood of information. This presents philosophy with new challenges. This book represents an attempt at sustained reflection on what thought really is, so that we might regain some form of control over the terrain currently occupied by the dubious magicians of Silicon Valley and their technophile adepts, who ostentatiously insist that they have created genuine artificial intelligence. We need to demystify and disenchant our gadgets and do away with the belief in their omnipotence. Otherwise, we condemn ourselves to a future as mere victims of digital transformation, hopeless info-junkies or brain-dead techno-zombies.

The Meaning of Thought

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