16 But what am I to answer to the assertion made that many calamities have befallen the Roman Empire through some Christian emperors? This sweeping accusation is a calumny. For if they would more clearly quote some indisputable facts in support of it from the history of past emperors, I also could mention similar, perhaps even greater calamities in the reigns of other emperors who were not Christians; so that men may understand that these were either faults in the men, not in their religion, or were due not to the emperors themselves, but to others without whom emperors can do nothing. As to the date of the commencement of the downfall of the Roman Republic, there is ample evidence; their own literature speaks plainly as to this. Long before the name of Christ had shone abroad on the earth, this was said of Rome: “O venal city, and doomed to perish speedily, if only it could find a purchaser!” In his book on the Catilinarian conspiracy, which was before the coming of Christ, the same most illustrious Roman historian declares plainly the time when the army of the Roman people began to be wanton and drunken; to set a high value on statues, paintings, and embossed vases; to take these by violence both from individuals and from the State; to rob temples and pollute everything, sacred and profane. When, therefore, the avarice and grasping violence of the corrupt and abandoned manners of the time spared neither men nor those whom they esteemed as gods, the famous honour and safety of the commonwealth began to decline. What progress the worst vices made from that time forward, and with how great mischief to the interests of mankind the wickedness of the Empire went on, it would take too long to rehearse. Let them hear their own satirist speaking playfully yet truly thus:—
Once poor, and therefore chaste, in former times
Our matrons were; no luxury found room
In low-roofed houses and bare walls of loam;
Their hands with labour burdened while 'tis light,
A frugal sleep supplied the quiet night;
While, pinched with want, their hunger held them strait,
When Hannibal was hovering at the gate;
But wanton now, and lolling at our ease,
We suffer all the inveterate ills of peace
And wasteful riot, whose destructive charms
Revenge the vanquished world of our victorious arms.
No crime, no lustful postures are unknown,
Since poverty, our guardian-god, is gone.
Why, then, do you expect me to multiply examples of the evils which were brought in by wickedness uplifted by prosperity, seeing that among themselves, those who observed events with somewhat closer attention discerned that Rome had more reason to regret the departure of its poverty than of its opulence; because in its poverty the integrity of its virtue was secured, but through its opulence, dire corruption, more terrible than any invader, had taken violent possession not of the walls of the city, but of the mind of the State?
17. Thanks be unto the Lord our God, who has sent unto us unprecedented help in resisting these evils. For whither might not men have been carried away by that flood of the appalling wickedness of the human race, whom would it have spared, and in what depths would it not have engulfed its victims, had not the cross of Christ, resting on such a solid rock of authority (so to speak), been planted too high and too strong for the flood to sweep it away? So that by laying hold of its strength we may become steadfast, and not be carried off our feet and overwhelmed in the mighty whirlpool of the evil counsels and evil impulses of this world. For when the empire was sinking in the vile abyss of utterly depraved manners, and of the effete ancient religion, it was signally important that heavenly authority should come to the rescue, persuading men to the practice of voluntary poverty, continence, benevolence, justice, and concord among themselves, as well as true piety towards God, and all the other bright and sterling virtues of life—not only with a view to the spending of this present life in the most honourable way, nor only with a view to secure the most perfect bond of concord in the earthly commonwealth, but also in order to the obtaining of eternal salvation, and a place in the divine and celestial republic of a people which shall endure for ever— a republic to the citizenship of which faith, hope, and charity admit us; so that, while absent from it on our pilgrimage here, we may patiently tolerate, if we cannot correct, those who desire, by leaving vices unpunished, to give stability to that republic which the early Romans founded and enlarged by their virtues, when, though they had not the true piety towards the true God which could bring them, by a religion of saving power, to the commonwealth which is eternal, they did nevertheless observe a certain integrity of its own kind, which might suffice for founding, enlarging, and preserving an earthly commonwealth. For in the most opulent and illustrious Empire of Rome, God has shown how great is the influence of even civil virtues without true religion, in order that it might be understood that, when this is added to such virtues, men are made citizens of another commonwealth, of which the king is Truth, the law is Love, and the duration is Eternity.
Source: Letters (New Advent)