Nothing is miserable unless you think it so; and on the other hand, nothing brings happiness unless you are content with it.

Nothing is miserable unless you think it so; and on the other hand, nothing brings happiness unless you are content with it.

没有什么是悲惨的，除非你这样认为;另一方面，没有什么能带来幸福，除非你满足于它。

-- Boethius 博伊修斯