Nature does not teach. A true philosophy may sometimes validate an experience of nature; an experience of nature cannot validate a philosophy. Nature will not verify any theological or metaphysical proposition (or not in the manner we are now considering); she will help to show what it means.
C. S. LewisBut one of the worst results of being a slave and being forced to do things is that when there is no one to force you any more you find you have almost lost the power of forcing yourself.
C. S. LewisYou never know how much you really believe anything until its truth of falsehood becomes a matter of life and death to you. It is easy to say you believe a rope to be strong and sound as long as you are merely using it to cord a box. But suppose you had to hang by that rope over a precipice. Wouldn't you then first discover how much you really trusted it?
C. S. Lewis