In the field of religion there are dogmatists of no-faith as there are of faith, and both seem to me closer to one another than those who try to keep the door open to the possibility of something beyond the customary ways in which we think, but which we would have to find, painstakingly, for ourselves. Similarly as regards science, there are those who are certain, God knows how, of what it is that patient attention to the world reveals, and those who really do not care, because their minds are already made up that science cannot tell them anything profound. Both seem to me profoundly mistaken. Though we cannot be certain what it is our knowledge reveals, this is in fact a much more fruitful position – in fact the only one that permits the possibility of belief. And what has limited the power of both art and science in our time has been the absence of belief in anything except the most diminished version of the world and our selves. Certainty is the greatest of all illusions: whatever kind of fundamentalism it may underwrite, that of religion or of science, it is what the ancients meant by hubris. The only certainty, it seems to me, is that those who believe they are certainly right are certainly wrong. The difference between scientific materialists and the rest is only this: the intuition of the one is that mechanistic application of reason will reveal everything about the world we inhabit, where the intuition of the others leads them to be less sure. Virtually every great physicist of the last century – Einstein, Bohr, Planck, Heisenberg, Bohm, amongst many others – has made the same point. A leap of faith is involved, for scientists as much as anyone. According to Max Planck, ‘Anybody who has been seriously engaged in scientific work of any kind realizes that over the entrance to the gates of the temple of science are written the words: Ye must have faith. It is a quality which the scientist cannot dispense with.’ And he continued: ‘Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are part of nature and therefore part of the mystery that we are trying to solve.
In this book certainty has certainly not been my aim. I am not so much worried by the aspects that remain unclear, as by those which appear to be clarified, since that almost certainly means a failure to see clearly. I share Wittgenstein’s mistrust of deceptively clear models: and, as Waismann said, ‘any psychological explanation is ambiguous, cryptic and open-ended, for we ourselves are many-layered, contradictory and incomplete beings, and this complicated structure, which fades away into indeterminacy, is passed on to all our actions.’ I am also sympathetic to those who think that sounds like a cop-out. But I do think that things as they exist in practice in the real world, rather than as they exist in theory in our re-presentations, are likely to be intrinsically resistant to precision and clarification. That is not our failure, but an indication of the nature of what we are dealing with. That does not mean we should give up the attempt. It is the striving that enables us to achieve a better understanding, but only as long as it is imbued with a tactful recognition of the limits to human understanding. The rest is hubris.
If it could eventually be shown definitively that the two major ways, not just of thinking, but of being in the world, are not related to the two cerebral hemispheres, I would be surprised, but not unhappy. Ultimately what I have tried to point to is that the apparently separate ‘functions’ in each hemisphere fit together intelligently to form in each case a single coherent entity; that there are, not just currents here and there in the history of ideas, but consistent ways of being that persist across the history of the Western world, that are fundamentally opposed, though complementary, in what they reveal to us; and that the hemispheres of the brain can be seen as, at the very least, a metaphor for these. One consequence of such a model, I admit, is that we might have to revise the superior assumption that we understand the world better than our ancestors, and adopt a more realistic view that we just see it differently – and may indeed be seeing less than they did.
Iain McGilchrist, The Master and His Emissary: The Divided Brain and the Making of the Western World.