Jamieson, Fausset & Brown

I wrote this same unto you--namely, that I would not come to you then (Co2 2:1), as, if I were to come then, it would have to be "in heaviness" (causing sorrow both to him and them, owing to their impenitent state). He refers to the first Epistle (compare Co1 16:7; compare Co1 4:19, Co1 4:21; Co1 5:2-7, Co1 5:13). sorrow from them of whom I ought to rejoice--that is, sorrow from their impenitence, when he ought, on the contrary, to have joy from their penitent obedience. The latter happy effect was produced by his first Epistle, whereas the former would have been the result, had he then visited them as he had originally proposed. having confidence . . . that my joy is the joy of you all--trusting that you, too, would feel that there was sufficient reason for the postponement, if it interfered with our mutual joy [ALFORD]. The communion of saints, he feels confident in them "ALL" (his charity overlooking, for the moment the small section of his detractors at Corinth, Co1 13:7), will make his joy (Co2 2:2) their joy.