出自汉·桓宽《盐铁论·险固》。这句话以“地利”与“人和”、“武力”与“文德”的对比，阐明了实行仁政对于治国安邦的重要性。

You have to believe in yourself when no one else does.

Writing is the only way I can breathe.

Curiosity is the engine that drives scientific discovery.

The quest to unify the fundamental forces of nature is one of the greatest challenges in modern physics.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.