Matthew 13:30

What then, if the tares should remain until the end? "Then I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them." He again reminds them of John's words, introducing Him as judge; and He saith, So long as they stand by the wheat, we must spare them, for it is possible for them even to become wheat; but when they have departed, having profited nothing, then of necessity the inexorable punishment will overtake them. "For I will say to the reapers," saith He, "Gather ye together first the tares." Why, "first?" That these may not be alarmed, as though the wheat were carried off with them. "And bind them in bundles to burn them, but gather the wheat into my barn."

In that He says that the bundles of tares are to be cast into the fire, and the wheat gathered into barns, it is clear that heretics also and hypocrites are to be consumed in the fires of hell, while the saints who are here represented by the wheat are received into the barns, that is into heavenly mansions.

(Quaest. in Matt. q. 12.) It may be asked why He commands more than one bundle or heap of tares to be formed? Perhaps because of the variety of heretics differing not only from the wheat, but also among themselves, each several heresy, separated from communion with all the others, is designated as a bundle; and perhaps they may even then begin to be bound together for burning, when they first sever themselves from the Catholic communion, and begin to have their independent church, so that it is the burning and not the binding into bundles that will take place at the end of the world. But were this so, there would not be so many who would become wise again, and return from error into the Catholic Church. Wherefore we must understand the binding into bundles to be what shall come to pass in the end, that punishment should fall on them not promiscuously, but in due proportion to the obstinacy and wilfulness of each separate error.

It follows, And in the time of harvest I will say to the reapers, Gather together first the tares, and bind them in bundles to burn them. The harvest is the season of reaping which here designates the day of judgment, in which the good are to be separated from the bad.

What then doth the Master? He forbids them, saying, "Lest haply ye root up the wheat with them." And this He said, to hinder wars from arising, and blood and slaughter. For it is not right to put a heretic to death, since an implacable war would be brought into the world. By these two reasons then He restrains them; one, that the wheat be not hurt; another, that punishment will surely overtake them, if incurably diseased. Wherefore, if thou wouldest have them punished, yet without harm to the wheat, I bid thee wait for the proper season. But what means, "Lest ye root up the wheat with them?" Either He means this, If ye are to take up arms, and to kill the heretics, many of the saints also must needs be overthrown with them; or that of the very tares it is likely that many may change and become wheat. If therefore ye root them up beforehand, ye injure that which is to become wheat, slaying some, in whom there is yet room for change and improvement. He doth not therefore forbid our checking heretics, and stopping their mouths, and taking away their freedom of speech, and breaking up their assemblies and confederacies, but our killing and slaying them. But mark thou His gentleness, how He not only gives sentence and forbids, but sets down reasons.