clear conscience
US /klɪr ˈkɑn.ʃəns/
UK /klɪr ˈkɑn.ʃəns/

1.
问心无愧, 清白
a feeling of guilt-free satisfaction from having done nothing wrong
:
•
After confessing, he finally had a clear conscience.
坦白后,他终于有了问心无愧的感觉。
•
I can leave with a clear conscience knowing I did my best.
我知道我尽力了,所以可以问心无愧地离开。