The only truly affluent are those who do not want more than they have.
唯一真正富有的是那些不想要比他们拥有的更多的人。
The teacher must believe in the potential of his students. He must see in each one of them a spark of the divine fire.
A good mathematician is someone who can see analogies between theorems; a great mathematician is someone who can see analogies between analogies.
The secret of life is to appreciate the pleasure of being terribly, terribly deceived.
No testimony is sufficient to establish a miracle unless the testimony be of such a kind that its falsehood would be more miraculous than the fact which it endeavors to establish.