Epictetus:

Treasure Your Mind, Cherish Your Reason, Hold Your purpose  

珍惜你的頭腦，愛護你的理性，握緊你的目標 

Don't surrender your mind.

If someone were to casually give your body away to any old passerby, you would naturally be furious.

不要放棄你的頭腦。

如果有人隨便將你的身體送給任何一個路人，你自然會暴怒。 

Why then do you feel no shame in giving your precious mind over to any person who might wish to influence you? Think twice before you give up your own mind to someone who may revile you, leaving you confused and upset.

那為什麼當你寶貴的頭腦任人影響時你卻不感覺到羞恥？在將你的頭腦交給有可能羞辱你而使你心煩意亂的人之前要三思。