ADAM SMITH & EPICTETUS

In addition to Mandeville, Smith may have gotten his notion of the Invisible Hand from Epictetus  (circa 55 AD-135 AD), specifically Book 1, Chapter 19 of his Discourses:

This is not a perverse self-regard, for the animal is constituted so as to do all things for itself. For even the sun does all things for itself; nay, even Zeus himself. But when he chooses to be the Giver of rain and the Giver of fruits, and the Father of gods and men, you see that he cannot obtain these functions and these names, if he is not useful to man; and, universally, he has made the nature of the rational animal such that it cannot obtain any one of its own proper interests, if it does not contribute something to the common interest. In this manner and sense it is not unsociable for a man to do everything, for the sake of himself. For what do you expect? that a man should neglect himself and his own interest? And how in that case can there be one and the same principle in all animals, the principle of attachment to themselves?