Jamieson, Fausset and Brown on 2 Corinthians 1:6

6. we ... afflicted ... for your consolation--exemplifying the communion of saints. Their hearts were, so to speak, mirrors reflecting the likenesses of each other (Php 2:26, 27) [Bengel]. Alike the afflictions and the consolations of the apostle tend, as in him so in them, as having communion with him, to their consolation (2Co 1:4; 4:15). The Greek for "afflicted" is the same as before, and ought to be translated, "Whether we be in tribulation."

which is effectual--literally, "worketh effectually."

in the enduring, &c.--that is, in enabling you to endure "the same sufferings which we also suffer." Here follows, in the oldest manuscripts (not as English Version in the beginning of 2Co 1:7), the clause, "And our hope is steadfast on your behalf."