当你停止相信的那一刻，你就已经失败了。

Little else is requisite to carry a state to the highest degree of opulence from the lowest barbarism but peace， easy taxes， and a tolerable administration of justice.

The essential function of art is moral. But a passionate, implicit morality, not didactic. A morality which changes the blood, rather than the mind.

研究涨落对于理解系统在平衡附近的行为至关重要。