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。

The mind tends to perceive objects as well-organized patterns rather than separate components.

The great powers are always searching for opportunities to gain power at the expense of rivals, and to dominate the system.

密码学是关于在存在对手的情况下进行通信的。