I have thought it necessary, my friend Liberalis, to state these facts, both because when speaking of small benefits one ought to make some mention of the greatest, and because also this shameless and hateful vice (of ingratitude), starting with these, transfers itself from them to all the rest. If a man scorn these, the greatest of all benefits, to whom will he feel gratitude, what gift will he regard as valuable or deserving to be returned: to whom will he be grateful for his safety or his life, if he denies that he has received from the gods that existence which he begs from them daily? He, therefore, who teaches men to be grateful, pleads the cause not only of men, but even of the gods............