The person who is deliberately guilty of a disgraceful action, we may lay it down, I believe, as a general rule, can seldom have much sense of the disgrace; and the person who is habitually guilty of it, can scarce ever have any.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“In smaller offences, as well as in greater crimes, it frequently happens that a person of sensibility is much more hurt by the unjust imputation, than the real criminal is by the actual guilt. A woman of gallantry laughs even at the well-founded surmises which are circulated concerning her conduct. The worst-founded surmise of the same kind is a mortal stab to an innocent virgin. The person who is deliberately guilty of a disgraceful action, we may lay it down, I believe, as a general rule, can seldom have much sense of the disgrace; and the person who is habitually guilty of it, can scarce ever have any. When every man, even of middling understanding, so readily despises unmerited applause, how it comes to pass that unmerited reproach should often be capable of mortifying so severely men of the soundest and best judgment, may, perhaps, deserve some consideration.” source