为了安心，我们晚上锁好门窗。

We lock our doors and windows at night for ___peace ___of ___mind.

毕竟，成功谋生能保证心安。

After all, successfully earning your living guarantees ___peace ___of ___mind.

拥有一份可靠的保险单让我感到安心。

Having a reliable insurance policy gives me ___peace ___of ___mind.