The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

你必须相信世界的真实性和其中人们的真实性。

The past is always tense, the future perfect.

教学的全部艺术，不过是唤醒年轻人天生的好奇心，以便日后满足它。