Adam Clarke on Matthew 13:29

But he said, Nay - God judges quite otherwise than men of this mixture of good and evil in the world; he knows the good which he intends to produce from it, and how far his patience towards the wicked should extend, in order to their conversion, or the farther sanctification of the righteous. Men often persecute a true Christian, while they intend only to prosecute an impious person. "A zeal for the extirpation of heretics and wicked men," said a pious Papist, "not regulated by these words of our blessed Savior, allows no time for the one to grow strong in goodness, or to the other to forsake their evil courses. They are of a spirit very opposite to his, who care not if they root up the wheat, provided they can but gather up the tares." The zeal which leads persons to persecute others for religious opinions is not less a seed of the devil than a bad opinion itself is.