In one sense of the word it is of course necessary, as the Greek oracle said, to know oneself: that is the first achievement of knowledge. But to recognise that the soul of a man is unknowable, is the ultimate achievement of wisdom.

从某种意义上说，正如希腊神谕所言，认识自己当然是必要的：这是求知的第一项成就。但承认人的灵魂不可尽知，则是智慧的最终成就。