Who shall also confirm you unto the end, that you may be blameless in the day of our Lord Jesus Christ.
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Ambrosiaster
AD 400
Paul is confident that the Corinthians will persevere in righteousness until the day of judgment. People who could not be shaken in spite of so many turmoils and disagreements proved that they would remain faithful to the end. In praising them, Paul is also challenging those who had been corrupted by the errors of the false apostles, for in proclaiming the faith of the former, he is calling the latter to repentance. Commentary on Paul’s Epistles.
Who shall also confirm you, so far as His part is; i.e, shall give grace which can confirm you, and shall confirm you indeed, if you are willing to receive it, to use it, and to confirm yourselves in the faith and love of Christ: shall confirm you, I say, for this, that ye may be, and may persevere unto the end (of life) blameless; that Isaiah , unaccused, whom no one can charge with having committed anything against the faith and love of Christ. The Apostle speaks to the whole Church, in which the greater number were holy and blameless, although some few were sowing schisms, and these in the following verse he reproves and condemns.
In the day of our Lord Jesus Christ. It is an ellipse common with the Apostle: for we must supply, that ye may be and may appear, blameless in that day of the advent and judgment of Christ.
7. Who shall also confirm you unto the end, that you may be unreprovable. Here he seems to court them, but the saying is free from all flattery; for he knows also how to press them home; as when he says, 1 Corinthians 4:18-21 Now some are puffed up as though I would not come to you: and again, What will you? Shall I come unto you with a rod, or in love, and in the spirit of meekness? And, 2 Corinthians 13:3 Since you seek a proof of Christ speaking in me. But he is also covertly accusing them: for, to say, He shall confirm, and the word unreprovable marks them out as still wavering, and liable to reproof.
But do thou consider how he always fastens them as with nails to the Name of Christ. And not any man nor teacher, but continually the Desired One Himself is remembered by him: setting himself, as it were to arouse those who were heavy-headed after some debauch. For no where in any other Epistle does the Name of Christ occur so continually. But here it is, many times in a few verses...