孕育过一次邪恶的灵魂，此后便无法滋养善良。

No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.

物理学的美丽不仅在于它提供的答案，还在于它揭示的奥秘。

我们就像迷失了方向的旅行者；每个人都必须向路人寻求指引。

幸福的秘密是自由，自由的秘密是勇气。