In physics, the simplest explanation is often the correct one.

The task must be made difficult, for only the difficult inspires the noble-hearted.

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

The balance of power is the only way to maintain peace in the international system.

释义：聪明人舍弃短处，发挥长处，以此来取得成功。阐明了扬长避短的重要性。

旅行是一种残酷。它迫使你信任陌生人，失去所有熟悉的家庭和朋友的舒适感。你不断地失去平衡。除了基本的东西：空气、睡眠、梦想、海洋、天空——所有趋向于永恒或我们想象中的永恒的东西，没有什么是属于你的。