Condemnation before investigation is the highest form of ignorance.

Good acts are like good poems. One may easily get their drift, but they are not rationally understood.

Thinking is to man what flying is to birds. Don’t follow the example of a chicken when you could be a lark.

Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.

It is really a puzzle what drives one to take one's work so devilishly seriously.

Insofar as we may at all claim that slavery has been abolished today, we owe its abolition to the practical consequences of science

My sailing system set sail, make it fast, no thoughts of energy or velocity, loll back, let boat drift.