He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.

He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.

智慧人不为自己没有的事忧愁，却为自己所有的事快乐。

-- Epictetus 埃皮克特斯