The genius is in making the complex simple.

The years of searching in the dark for a truth that one feels but cannot express, the intense desire and the alternations of confidence and misgiving until one breaks through to clarity and understanding, are known only to him who has experienced them himself.

The mathematician knows some things, no doubt, but not those things one usually wants to get from him.

The world is not full of evil because of those who do wrong. It is full of evil because of those who do nothing.

I became more and more convinced that even nature could be understood as a relatively simple mathematical structure.

To act intelligently in human affairs is only possible if an attempt is made to understand the thoughts, motives, and apprehension of one's opponent so fully that one can see the world through their eyes.

I have come to know the mutability of all human relationships and have learned to insulate myself against both heat and cold so that a temperature balance is fairly well assured.