Patriotism is your conviction that this country is superior to all other countries because you were born in it.

抑制和引导本能冲动，使其可用于更高的文化活动，是文明的基本力量。

UNIX is very simple, it just needs a genius to understand its simplicity.

In the depth of winter, I finally learned that within me there lay an invincible summer.

地球形状的问题本质上是势理论中的一个问题。