There is nothing either good or bad, but thinking makes it so.

　　——William Shakespeare, "Hamlet"

　　世上之事物本无善恶之分,思想使然。——莎士比亚《哈姆雷特》

The fool doth think he is wise, but the wise man knows himself to be a fool.

　　——William Shakespeare, "As You Like It"

　　愚者自以为聪明，智者则有自知之明。——莎士比亚《皆大欢喜》

Cowards die many times before their deaths; the valiant never taste of death but once.

　　——William Shakespeare, "Julius Caesar"

　　懦夫在未死以前就已经死了好多次;勇士一生只死一次。——莎士比亚《凯撒大帝》

这是我比较喜欢的几个。