Chapter XX: Introduction: Whatever praise or blame can be due to any action, must (7)

There is an obvious reason why custom should never pervert our sentiments with regard to the general style and character of conduct and behaviour, in the same degree as with regard to the propriety or unlawfulness of particular usages. There never can be any such custom. No society could subsist a moment, in which the usual strain of men's conduct and behaviour was of a piece with the horrible practice I have just now mentioned.

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_Part VI.--Of the Character of Virtue._