The world is like a chessboard， whereon we may see a living knight， but we cannot see a living chess.

Sleep， those little slices of death — how I loathe them.

生活是一场冒险，或者它根本不值得一活。

做人的气度要高旷但不可疏漏狂妄；心思要缜密但不可琐碎；趣味要淡但不可枯燥；操守要严明但不可激烈。

The only way to change behavior is through manipulation of reinforcement contingencies.

习俗并非任何协议或契约的结果，而是长期发展过程的产物，在此过程中它们适应了社会的生活条件。