"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."

The only way to get through life is to laugh your way through it. You either have to laugh or cry. I prefer to laugh. Crying gives me a headache.

The true teacher defends his pupils against his own personal influence. He inspires self-distrust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.

形式化方法的美在于它们能够提供关于系统正确性的绝对确定性。

不沉溺于过去，专注未来。

The metropolis exacts from man as a discriminating creature a different amount of consciousness than does rural life.