“And besides, also, one only Catholic and Apostolic Church, which can never be destroyed, though all the world should seek to make war with it; but it is victorious over every most impious revolt of the heretics who rise up against it. For her Goodman hath confirmed our minds by saying, ‘Be of good cheer, I have overcome the world.’ ” Alexander of Alexandria, Epistle on the Arian Heresy, 12 (A.D. 321).
“The Church, ordained by the Lord and established by His Apostles, is one for all; but the frantic folly of discordant sects has severed them from her. And it is obvious that these dissensions concerning the faith result from a distorted mind, which twists the words of Scripture into conformity with its opinion, instead of adjusting that opinion to the words of Scripture. And thus, amid the clash of mutually destructive errors, the Church stands revealed not only by her own teaching, but by that of her rivals. They are ranged, all of them, against her; and the very fact that she stands single and alone is her sufficient answer to their godless delusions. The hosts of heresy assemble themselves against her; each of them can defeat all the others, but not one can win a victory for itself. The only victory is the triumph which the Church celebrates over them all.” Hilary of Poitiers, On the Trinity, 7:4 (A.D. 359).
“ ‘For the temple of God is holy,’ says the Apostle, ‘which (temple) are ye.’ This same is the holy Church, the one Church, the true Church, the Catholic Church, fighting against all heresies: fight, it can: be fought down, it cannot. As for heresies, they went all out of it, like as unprofitable branches pruned from the vine: but itself abideth in its root, in its Vine, in its charity. ‘The gates of hell shall not prevail against it.’” Augustine, Sermon to the Catechumens on the Creed, 6:14 (A.D. 377).