when he comes to be glorified in his saints, and to be admired among all those who have believed (because our testimony to you was believed) in that day.
"When he shall come..." The day of the second coming of, the parousia, specifies the time when the wicked will suffer the punishment of eternal destruction. The Greek has "whenever" with the aorist subjunctive, a construction indicating the certainty of the event and yet the uncertainty of the time of it. "That day" in the first epistle refers to the second coming of Christ (5:4) (Kelcy, 146).