The Republic by Plato Part 1 Page 13

offerings due to the gods or debts which he owes to men.

Now to this peace of mind the possession of wealth greatly contributes; and therefore I say, that, setting one thing against another, of the many advantages which wealth has to give, to a man of sense this is in my opinion the greatest.

Well said, Cephalus, I replied; but as concerning justice, what is it? — to speak the truth and to pay your debts — no more than this? And even to this are there not exceptions? Suppose that a friend when in his right mind has deposited arms with me and he asks for them when he is not in his right mind, ought I to give them back to him? No one would say that I ought or that I should be right in doing so, any more than they would say that I ought always to speak the truth to one who is in his condition.