"The truth is rarely pure and never simple."

I don’t believe in ‘finished’—art is always evolving.

The fountain of content must spring up in the mind, and they who have so little knowledge of human nature as to seek happiness by changing anything but their own dispositions will waste their lives in fruitless efforts.

人们生产生活资料的方式首先取决于他们发现并必须再生产的实际手段的性质。

我认为科学具有极大的美。实验室里的科学家不仅是一名技术人员：他还是一个站在自然现象面前的孩子，这些现象对他来说就像童话一样令人印象深刻。