John Calvin Commentary 2 Thessalonians 2:14

"whereunto he called you through our gospel, to the obtaining of the glory of our Lord Jesus Christ." — 2 Thessalonians 2:14 (ASV)

To which he called us. He repeats the same thing, though in somewhat different terms. For the sons of God are not called otherwise than to the belief of the truth. Paul, however, meant to show here how competent a witness he is for confirming that matter of which he was a minister. He accordingly puts himself forward as a surety, so that the Thessalonians may not doubt that the gospel, in which they had been instructed by him, is the safety-bringing voice of God, by which they are aroused from death and are delivered from the tyranny of Satan. He calls it his gospel, not as if it had originated with him, but because the preaching of it had been committed to him.

What he adds, to the acquisition or possession of the glory of Christ, may be taken either in an active or a passive sense—either as meaning that they are called so that they may one day possess glory in common with Christ, or that Christ acquired them with a view to His glory. And so, this will be a second means of confirmation: that He will defend them, since they are nothing less than His own inheritance, and, in maintaining their salvation, He will stand forward in defense of His own glory. The latter meaning, in my opinion, suits better.