C S Lewis =Edit
- "...It is agreed on all hands that reason, and even sentience, and life itself are late comers in Nature. If there is nothing  but Nature, therefore, reason must have come into existence by a historical process. And of course, for the Naturalist, this process was not designed to produce a mental behaviour that can find truth. There was no Designer; and indeed, until there were thinkers, there was no truth or falsehood. The type of mental behaviour we now call rational thinking or inference must therefore have been 'evolved' by natural selection, by the gradual weeding out of types less fitted to survive...."
Other than noting they were weeded out , how was their less fittedness measured?