Augustine of Hippo
Catena Aurea · Matthäusevangelium 13
Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field: But while men slept, his enemy came and sowed tares among the wheat, and went his way. But when the blade was sprung up, and brought forth fruit, then appeared the tares also. So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field; from whence then hath it tares? He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up? But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
(Quæst. in Matt. q. 12.) Wherein He renders them more patient and tranquil. For this He says, because good men while yet weak, have need in some things of being mixed up with bad, either that they may be proved by their means, or that by comparison with them they may be greatly stimulated and drawn to a better course. Or perhaps the wheat is declared to be rooted up if the tares should be gathered out of it, on account of many who though at first tares would, after become wheat; yet they would never attain to this commendable change were they not patiently endured while they were evil. Thus were they rooted up, that wheat which they would become in time if spared, would be rooted up in them. It is then therefore He forbids that such should be taken away out of this life, lest in the endeavour to destroy the wicked, those of them should be destroyed among the rest who would turn out good; and lest also that benefit should be lost to the good which would accrue to them even against their will from mixing with the wicked. But this may be done seasonably when, in the end of all, there remains no more time for a change of life, or of advancing to the truth by taking opportunity and comparison of others’ faults; therefore He adds, Let both grow together until the harvest, that is, until the judgment.