Dictionary definition: A clean CONSCIENCE is a good pillow

A clean CONSCIENCE is a good pillow There are a number of traditional ways of expressing the notion that a clear conscience enables its possessor to sleep soundly, even, as a well-attested variant claims, through a thunderstorm—as in c 1605 Shakespeare Macbeth iv . i. 85
I may tell pale-hearted fear it lies, And sleep in spite of thunder. Cf. Ger. Gut Gewissen ist ein sanftes Ruhekissen ; Fr. Une conscience pure est un bon oreiller .
1721 J. Kelly Scottish Proverbs 14
A safe Conscience makes a sound Sleep.
1747 ...

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