在数学中，提出问题的艺术必须比解决问题更有价值。
Free trade enables the most advantageous distribution of the national produce and revenue.
The Ethiopians say that their gods are snub-nosed and black, the Thracians that theirs have light blue eyes and red hair.
Innovation is seeing what everybody has seen and thinking what nobody has thought.
The farmer's best implement is his mind.
告诉我动机，我会告诉你结果。
我已经学会通过限制欲望来寻求幸福，而不是试图满足它们。
作家的职责是讲述真相，即使它令人不安。