Letter 81 (§12)

“Again, the objector mentioned above wonders at our saying: “The wise man alone knows how to love, the wise man alone is a real friend.” And yet it is a part of love and of friendship to return favours; nay, further, it is an ordinary act, and happens more frequently than real friendship. Again, this same objector wonders at our saying, “There is no loyalty except in the wise man,” just as if he himself does not say the same thing! Or do you think that there is any loyalty in him who does not know how to return a favour?”