The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

最好的艺术来自个人经历。

成为哲学家不仅仅是有微妙的思想，甚至也不是建立一个学派，而是如此热爱智慧以至于按照它的指示生活。