人类行为是自然的一部分，可以通过自然科学的方法来研究。

文学的美在于它能够将痛苦转化为某种崇高的东西。

The true cost of coal isn't just in its price, but in how we manage its consequences.

Leadership means making tough decisions today for a better tomorrow.

I'm not afraid to fall, because I know I'll get back up.

要说服某人相信真理，仅仅陈述它是不够的，它必须被发现。