A mathematician is a device for turning coffee into theorems.

I have learnt how to live... how to be in the world and of the world, and not just to stand aside and watch.

心理学必须是一门观察的科学，而非推测。

艺术是沉思。它是心灵的愉悦，心灵在自然中探寻，并在那里预见到自然本身所激发的精神。

The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.

变老最好的事情是，你不会失去你曾经经历过的所有其他年龄段。

电子产品的未来在于可持续性——设计时要考虑到最终结果。