最可怕的事情就是不容忍的乌托邦。

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.

解读：学习知识、体悟智慧是个不断深入的过程，接触越多，越能发现未知领域广袤无垠，越深感自身渺小，激励持续求知探索。