1 Thessalonians 5:14

But if we are to hate ungodly and lawless men, we shall go on to hate also sinners; and thus in regular process thou wilt be broken off from the most even of thy brethren, or rather from all: for there is not one, no, not one, without sin. For if it be our duty to hate the enemies of God, one must not hate the ungodly only, but also sinners: and thus we shall be worse than wild beasts, shunning all, and puffed up with pride; even as that Pharisee. But not thus did Paul command us, but how? "Admonish the disorderly, encourage the faint-hearted, support the weak, be long suffering toward all."

"And we exhort you, brethren, admonish the disorderly, encourage the faint-hearted, support the weak, be long suffering toward all." Here he addresses those who have rule. Admonish, he says, "the disorderly," not of imperiousness, he says, nor of self-will rebuke them, but with admonition. "Encourage the fainthearted, support the weak, be longsuffering toward all." For he who is rebuked with harshness, despairing of himself, becomes more bold in contempt. On this account it is necessary by admonition to render the medicine sweet. But who are the disorderly? All those who do what is contrary to the will of God. For this order of the Church is more harmonious than the order of an army; so that the reviler is disorderly, the drunkard is disorderly, and the covetous, and all who sin; for they walk not orderly in their rank, but out of the line, wherefore also they are overthrown. But there is also another kind of evils, not such as this indeed, but itself also a vice, little mindedness. For this is destructive equally with sloth. He who cannot bear an insult is feeble-minded. He who cannot endure trial is feeble-minded. This is he who is sown upon the rock. There is also another sort, that of weakness. "Support the weak," he says; now weakness occurs in regard to faith. But observe how he does not permit them to be despised. And elsewhere also in his Epistles he says, "Them that are weak in the faith receive ye." (Rom. xiv. 1) For in our bodies too we do not suffer the weak member to perish. "Be longsuffering toward all," he says. Even toward the disorderly? Yes, certainly. For there is no medicine equal to this, especially for the teacher, none so suitable to those who are under rule. It can quite shame and put out of countenance him that is fiercer and more shameless than all men.

Of course, even good men can be sick, suffering from that disobedience which is the penalty of a primal disobedience which, therefore, is a wound or weakness in a nature that is good in itself. It is because of this wound that the good who are growing in grace and living by faith during their pilgrimage on earth are given the counsels, "Bear one another's burdens, and so you will fulfill the law of Christ," and elsewhere, "We exhort you, brothers, reprove the irregular, comfort the fainthearted, support the weak, be patient toward all men. See that no one renders evil for evil to any man." … It is in this way that citizens of the City of God are given medicine during their pilgrimage on earth while praying for the peace of their heavenly fatherland. And, of course, the Holy Spirit is operative internally to give healing power to the medicine which is applied externally, for, otherwise, no preaching of the truth is of any avail. Even though God makes use of one of his obedient creatures, as when he speaks in human guise to our ears—whether to the ears of the body or to the kind of ears we have in sleep—it is only by his interior grace that he moves and rules our mind.