John Chrysostom
And observe: concerning the thorns he did not say that it "brings forth thorns and thistles." He did not use such an approving expression. What did he say? "It produces thorns and thistles," as though it were casting up and throwing them out.
"Worthless and near to being cursed." O, what consolation is contained in these words!
He says, "near to being cursed." He did not say, "cursed." That is, it has not yet fallen under the curse, but is only near it. Yet it may also be far from it.
He consoles them not only by these words, but also by what follows. He did not say, "It is worthless, near to being cursed, and will be burned."
What did he say? "Whose end is to be burned." He shows that if it remains such to the end, it will also suffer this.
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Therefore, if we root out and burn the thorns, we can obtain many blessings, become useful, and be counted worthy of blessing.
He rightly calls sin a thorn in the words, "produces thorns and thistles." For if you hold fast to sin, it pierces and stings, and even in appearance it is ugly.
Thus, after reproving them sufficiently, frightening and rebuking them, the Apostle then comforts them. He does this so as not to strike them too hard, and so that they do not become careless.
For when a lazy man is punished too much, he becomes still lazier.
Therefore the Apostle does not approve them in everything, lest they become proud. Nor does he reproach them in everything, lest he make them more careless.
Having spoken a little reproach, in the following words he offers great consolation, so that in this way he may attain his purpose.
What, then, does he say?