Almost all of us have been faced with the questioning of a child by repeating one word over and over He can be very frustrating to us as he asks Why? If you put a h1ife beyond his reach, he wants to know, Why? When you explain it is sharp, he asks "Why?" And so you explain, in order to cut fruit, and he asks, Why? And so it goes

It illustrates the dilemma of applying reason. What we have to do when we apply reason is first to set standards of proof. We decide for ourselves, "What will I be satisfied with if I find such and such and so and so that constitutes for me a final proof?" We have to decide on that first.

What happens though, is that on the really important issues, the philosophical matters, thinkers set standards and eventually they may arrive at their standards. They may arrive at the point which they say would constitute a proof. But then they ask for a proof of the proof.