The first step is to establish that something is possible; then probability will occur.

The world is full of stories, but only some of them get told.

My voice was my weapon, my shield, and my sanctuary.

Sometimes in life, you don't always feel strong, but that doesn't mean you're not.

——1896年，伦敦蒙难后许多人问孙：“我们看到你，你这位先生的革命事业不知道失败过多少次了，为什么还不丧气，总是这么热心呢？这是什么理由呢？”

判断两个λ表达式是否等价的问题是无法解决的。

刚强纯洁的高尚人品，要在烈火般艰苦的斗争中锤炼；惊天动地的丰功伟业，必须在薄冰般险恶的环境里前进。