But the materialists have two problems. Their certainty of victory is, for the moment, a leap of faith. There is no clear scientific consensus on how the brain produces the higher functions we call being human. And, second, the great mystery, the ultimate hard question, remains: How does matter produce mind, how can it? Irrespective of religious belief, immaterialism cannot easily be dismissed. What is the nature of what I am thinking and feeling now? To tell me that it is all a by-product of my brain is to tell me nothing. What I am is at least as real as the chair I am sitting on, and what I am seems to be immaterial.
Hard scientists and militant atheists tend to dismiss this as spilt religion or philosophical hair-splitting, a futile pursuit of an artifact of language. But all serious thinkers understand the problem. Most, however, will fall back on what the philosopher of science Karl Popper called "promissory materialism." We will, one day, find the material answers because, in essence, we must. There simply cannot be anything other than matter. Bryan Appleyard book review