Men in the inferior and middling stations of life, besides, can never be great enough to be above the law, which must generally overawe them into some sort of respect for, at least, the more important rules of justice.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“Abilities will even sometimes prevail where the conduct is by no means correct. Either habitual imprudence, however, or injustice, or weakness, or profligacy, will always cloud, and sometimes depress altogether, the most splendid professional abilities. Men in the inferior and middling stations of life, besides, can never be great enough to be above the law, which must generally overawe them into some sort of respect for, at least, the more important rules of justice. The success of such people, too, almost always depends upon the favour and good opinion of their neighbours and equals; and without a tolerably regular conduct these can very seldom be obtained. The good old proverb, therefore, That honesty is the best policy, holds, in such situations, almost always perfectly true.” source