The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

The most incomprehensible thing about the world is that it is at all comprehensible.

不是锤的敲打，乃是水的载歌载舞，使鹅卵石臻於完美。

True progress happens when we stop defending the status quo and start challenging it.

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.

"The lifeblood of any business is its customers."