The greatest tragedy in life is not death, but the unlived life.

Imagination is the beginning of creation. You imagine what you desire, you will what you imagine, and at last, you create what you will.

【释义】富贵不能使我骄奢淫逸，贫贱不能使我改移节操，威武不能使我屈服意志。

数学的本质在于它的自由。

历史学家既是侦探，也是讲故事的人。

如果你活着，你就得挥舞胳膊腿，上蹿下跳，制造噪音，因为生命与死亡截然相反。