There is no virtue without propriety, and wherever there is propriety some degree of approbation is due.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“The description of virtue, besides, which is either given, or at least meant and intended to be given in each of those systems, for some of the modern authors are not very fortunate in their manner of expressing themselves, is no doubt quite just, so far as it goes. There is no virtue without propriety, and wherever there is propriety some degree of approbation is due. But still this description is imperfect. For though propriety is an essential ingredient in every virtuous action, it is not always the sole ingredient. Beneficent actions have in them another quality by which they appear not only to deserve approbation but recompense.” source