John Chrysostom
Then the Apostle again turns his discourse to the one firm in faith: 'Who are you, judging another's servant?' From this it is clear that the firm in faith not only despised the weak, but also condemned them. 'Before his own Lord he stands or falls.' Here is again a new blow. The reproach is apparently directed at the strong man, but it touches the weak man. When the Apostle says, 'he will be made to stand,' he shows that the man still wavers and needs great attention. He needs such care that God must be called upon to help heal him. 'For God is able to make him stand,' he continues. Such things are said about people in a very hopeless condition.
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But so that you should not despair of him, the Apostle, despite his weakness, calls him God's servant, saying, 'Who are you, judging another's servant?' Meanwhile here too he again imperceptibly deals a blow to the weak man. I command you not to judge him, not because his actions do not deserve condemnation, but because he is another's servant, that is, not yours but God's. Then, encouraging him again, he does not say, 'he falls,' but how? 'He stands or falls.' If either happens to him, all this depends on the Lord. If he falls, the loss is God's. Likewise, if he stands, the gain is God's. Such indifference, however, would be wholly unworthy of the care fitting for Christians, unless we again attend to Paul's purpose. He wants reproaches not to be made against the weak in faith before the proper time. As I have always said, it is necessary to consider the disposition with which something is said, the substance of the matter spoken about, and what the speaker is trying to correct. Having said this, the Apostle put the one who reproached to shame, and not without reason. If God, Paul reasons, while suffering loss, does nothing for the present, are you not acting untimely? Are you not going beyond the boundaries, tormenting and troubling a brother weak in faith?