He is not content with what he has already got. What a pity he never understands that happiness lies in contentment.

他已有的一切还不满足。他从来不懂“知足常乐”，真遗憾。

Realize that true happiness lies within you. Waste no time and effort searching for peace and contentment and joy in the world outside.

了解真正的快乐存在于自己心中，不要浪费时间与力气于外在世界寻求安心、满足与快乐。