每个程序都有（至少）两个目的：一个目的是为它编写的，另一个不是目的。
Every program has (at least) two purposes: the one for which it was written, and another for which it wasn't.
The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.
I earnestly wish to point out in what true dignity and human happiness consists.
最好的皮革来自于对动物和环境的尊重。
完美数如同完美的人一样，非常罕见。