后生可畏,焉知来者之不如今也?四十、五十而无闻焉,斯亦不足畏也已。
年轻人是可怕的,因为怎么能知道他的将来不如我们现在呢?但如果一个人到了四十、五十岁还默默无闻,他也就没有什么可怕的了。
The world is not a problem to be solved; it is a living being to which we belong.