A quiet conscience sleeps in thunder.
白天不做亏心事，夜里不怕鬼敲门。
《新英汉大辞典》
He can look with a quiet conscience into the eyes of his friends.
他能问心无愧地面对自己的朋友。
youdao
A peace above all earthly dignities, a still and quiet conscience.
有一种宁静超越尘世间的所有尊贵，那种寂静平和的良心。
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