Book 5.15
"In the same way," argues our adversary, "that your school proves that no one is ungrateful, you afterwards prove that all men are ungrateful. For, as you say, all fools are bad men; he who has one vice has all vices; all men are both fools and bad men; therefore all men are ungrateful." Well, what then? Are they not? Is not this the universal reproach of the human race? is there not a general complaint that benefits are thrown away, and that there are very few men who do not requite their benefactors with the basest ingratitude? Nor need you suppose that what we say is merely the grumbling of men who think every act wicked and depraved which falls short of an ideal standard of righteousness. Listen! I know not who it is who speaks, yet the voice with which he condemns mankind proceeds, not from the schools of philosophers, but from the midst of the crowd:
"Host is not safe from guest;
Father-in-law from son; but seldom love
Exists 'twixt brothers; wives long to destroy
Their husbands; husbands long to slay their wives."
This goes even further: according to this, crimes take the place of benefits, and men do not shrink from shedding the blood of those for whom they ought to shed their own; we requite benefits by steel and poison. We call laying violent hands upon our own country, and putting down its resistance by the fasces of its own lictors, gaining power and great place; every man thinks himself to be in a mean and degraded position if he has not raised himself above the constitution; the armies which are received from the state are turned against her, and a general now says to his men, "Fight against your wives, fight against your children, march in arms against your altars, your hearths and homes!" Yes, you, who even when about to triumph ought not to enter the city at the command of the senate, and who have often, when bringing home a victorious army, been given an audience outside the walls, you now, after slaughtering your countrymen, stained with the blood of your kindred, march into the city with standards erect. "Let liberty," say you, "be silent amidst the ensigns of war, and now that wars are driven far away and no ground for terror remains, let that people which conquered and civilized all nations be beleaguered within its own walls, and shudder at the sight of its own eagles."