We don't inherit the earth from our ancestors; we borrow it from our children.

你的时间有限，所以不要浪费在过别人的生活上。

The whole conviction of my life now rests upon the belief that loneliness, far from being a rare and curious phenomenon, peculiar to myself and to a few other solitary men, is the central and inevitable fact of human existence.

在研究自然时，想象力必须受到逻辑和实验的严格规则指导。