A good conscience is a soft pillow.

　　A quiet conscience sleeps in thunder.

　　eg：He relaxed as a good conscience is a soft pillow after he had paid the debt.

　　同义词：生平不做亏心事，半夜不怕鬼敲门 A clear conscience is a coat of mail.

　　反义词：坐立不安 Sit on a bag of fleas.