Who are you that judge another man's servant? to his own master he stands or falls. Yea, he shall be held up: for God is able to make him stand.
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A Treatise Against the Heretic Novatian
AD 255
And yet thou, O Novatian, judgest and declarest that the lapsed have no hope of peace and mercy, nor inclinest thine ear to the rebuke of the apostle, when he says "Who art thou, who judgest another man's servant? To his own master he standeth or falleth. Yea, he shall stand. God is mighty to establish him."
Paul says this so that, when something might be done with either good or bad motives, we should leave the judgment to God and not presume to judge the heart of someone else, which we do not see. But when it comes to things which obviously could not have been done with good and innocent intentions, it is not wrong if we pass judgment. So in the matter of food, where it is not known what the motive in eating it is, Paul does not want us to be judges, but God. But in the case of that abominable immorality where a man had taken his stepmother, Paul taught us to judge. For that man could not possibly claim that he committed such a gross act of indecency with good intentions. So we must pass judgment on things which are obviously wrong.
These men were of a mind to pass judgment with regard to things which may indeed be done with a bad intention but which may also be done with an upright, simple and magnanimous motive. Although they were men, they wanted to judge the secrets of the heart—secrets of which God alone is the judge. .
And in another place he says, "Who art thou that judgest another man's servant? To his own master he standeth or falleth; yea, he shall stand, for God is able to make him stand.".
Of this same subject to the Romans: "Who art thou that judgest another man's servant? to his own master he standeth or falleth. But he shall stand; for God is able to make him stand."
A servant of Christ is anyone whom Christ has accepted. He is then no longer under the law. Who are you, therefore, to judge someone by the law when he is a stranger to it? Pauline Commentary from the Greek Church.
It is not because someone does things which are worthy of escaping judgment that we are not to judge, but because the person in question is another man’s servant—not ours but God’s. It is up to God to decide what to do.