在物理学中，最简单的解释往往是正确的。

The human being needs sadness as much as he needs joy.

We must eradicate from the soul all fear and terror of what comes towards us out of the future.

愚蠢的人认为说真话很容易；只有艺术家，伟大的艺术家，知道这有多难。

创新是开启可持续能源未来的关键。