Nothing is more graceful than the behaviour of the man who appears to resent the greatest injuries, more from a sense that they deserve, and are the proper objects of resentment, than from feeling himself the furies of that disagreeable passion
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“We ought to reward from the gratitude and generosity of our own hearts, without any reluctance, and without being obliged to reflect how great the propriety of rewarding: but we ought always to punish with reluctance, and more from a sense of the propriety of punishing, than from any savage disposition to revenge. Nothing is more graceful than the behaviour of the man who appears to resent the greatest injuries, more from a sense that they deserve, and are the proper objects of resentment, than from feeling himself the furies of that disagreeable passion; who, like a judge, considers only the general rule, which determines what vengeance is due for each particular offence; who, in executing that rule, feels less for what himself has suffered, than for what the offender is about to suffer;” source