To feel that one has done the right thing.
觉得自己做了正确的事情。 (Juede ziji zuo le zhengque de shiqing.)
"After returning the lost wallet, he went to bed with a clear conscience."
"在归还丢失的钱包后，他心安理得地上床睡觉。" (Zai gui huan diu shi de qianbao hou, ta xin an li de de shang chuang shui jiao.)
