Profitability and responsibility must go hand in hand.

"The world is full of stories, and every story is a world in itself."

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

You must be the change you wish to see in the world.

已婚者的快乐来自那些他没有娶的人。