Pain is not always physical; sometimes the deepest wounds are the ones we cannot see.

解释：看到乱子出现，若不警惕，损失就会更多；如果想掩饰自己的过错，只会使过错更加明显地表露出来。

艺术不必有任何意义，它只需要对你有意义。

A room is not a room without natural light.

In science, we must be interested in things, not in persons.

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.