I will make a point about the progress of science in this subject and then use that to step towards a more general argument for the innate mystery of consciousness with regards to reason.

Ever since the time of the enlightenment there has been a real movement in the west to view the world as purely mechanical/physical so that a conclusion of reason as a universal tool could be accepted. That meant the elimination from society of not just God but also the soul and other things.

Ironically it was a particular invention of science and reason that made rationalists realize the problem of eliminiating all non-mechanical/physical realities from a human being: the computer. With the development of the computer it became painfully obvious that human beings were fundamentally different from any designed piece of technology. Although they could theoratically design and program a coputer for all kinds of amazing functions, there is no rational model as to how to make that machine 'conscious'. It was through computers that mankind realized in the most clear and blunt way the mystery of consciousness.

So to reassert my point....from the development of computers throughout this past century into the advancment of it to this century, the more we progress the more we understand that consciousness does not seem to be a matter of just complexity and sophistication.

Secondly, our faculty of reason itself does not even work in the same way a computer works. A computer's mechanical structure "signals" a conclusion. The machine moves in a certain way, albeith at the tiniest levels, to signal that something is right or wrong. For us, it is understanding that makes us realize a right or wrong, it is a feeling. Even at the most fundamental level of using reason itself the mystery of consciousness is engaged and operating in a way we do not understand.