我不记得我曾几何时有过如此平静的心境。

I cannot remember when I have had this much peace of mind.

youdao

我羡慕你平静的心境，纯洁的良心和没有玷污过的记忆。

I envy your peace of mind, your clean conscience, your unpolluted memory.

youdao

诚实的生活会给你带来平静的心境，而平静的心境则是最无价。

Living a life of honesty creates peace of mind, and peace of mind is priceless. Period.

youdao