“安心”的英文是"peace of mind"。这个词的英文来源是拉丁语，它的拉丁语意思是"安宁，平静"。

例句：

Getting a good night's sleep can help you find peace of mind. (睡一个好觉可以帮助你安心。)

I hope that you find peace of mind in the knowledge that you did everything you could. (我希望你能通过自己已经尽了一切努力的事实而安心。)

I find peace of mind in knowing that I'm doing my best. (我会因为我已经尽力了而安心。)