自然是无情且不可改变的，它不在乎其隐藏的原因和行为是否能为人类所理解。

一个观念的效用决定了它在精神生活中的地位。

We don't inherit the earth from our ancestors; we borrow it from our children. This principle guides every step we take.

The universe is not required to be in perfect harmony with human ambition.

The biggest risk is not taking any risk at all.

最好的想法来自于不知道答案。