Wherein He renders them more patient and tranquil. For this He says, because good 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.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Quaest. in Matt., q. 12