John Calvin Commentary 2 Corinthians 1:14

"as also ye did acknowledge us in part, that we are your glorying, even as ye also are ours, in the day of our Lord Jesus." — 2 Corinthians 1:14 (ASV)

For we are your glorying. We have briefly referred to the manner in which it is allowable for saints to glory in God’s benefits—when they rest in God alone and have no other aim. Thus, it was a ground of pious glorying for Paul that he had, by his ministry, brought the Corinthians under obedience to Christ; and for the Corinthians, on the other hand, that they had been trained so faithfully and virtuously by such an Apostle—a privilege that had not been given to all. This way of glorying in people does not prevent our glorying in God alone.

Now he instructs the Corinthians that it is of the greatest importance for them to acknowledge him as a faithful, and not a merely pretended, servant of Christ. This is because, if they withdrew from him, they would deprive themselves of the highest glory. In these words, he reproves their fickleness, since they voluntarily deprived themselves of this highest glory by listening too easily to the spiteful and envious.

In the day of the Lord—by this I understand the last day, which will put an end to all the fleeting glories of this world. He means, then, that the glorying of which he is now speaking is not short-lived, like those things that glitter in human eyes, but is abiding and stable, since it will remain until the day of Christ. For then will Paul enjoy the triumph of the many victories that he had obtained under Christ’s guidance, and will lead forth in splendor all the nations that have, by means of his ministry, been brought under Christ’s glorious yoke; and the Church of the Corinthians will glory in having been founded and trained by the services of so distinguished an Apostle.