If one only wished to be happy, this could be easily accomplished; but we wish to be happier than other people, and this is always difficult, for we believe others to be happier than they are.

最大的幸福是知道不幸的根源。

放空你的心，如水一般无形，化为水吧，我的朋友。

相对论不仅仅是一个科学理论，而且是一个哲学理论。