Jamieson, Fausset and Brown on 2 Corinthians 4:17

17. which is but for a moment--"Our PRESENT light (burden of) affliction" (so the Greek; compare Mt 11:30), [Alford]. Compare "now for a season ... in heaviness" (1Pe 1:6). The contrast, however, between this and the "ETERNAL weight of glory" requires, I think, the translation, "Which is but for the present passing moment." So Wahl. "The lightness of affliction" (he does not express "burden" after "light"; the Greek is "the light of affliction") contrasts beautifully with the "weight of the glory."

worketh--rather, "worketh out."

a far more exceeding and--rather, "in a surpassing and still more surpassing manner" [Alford]; "more and more exceedingly" [Ellicott, Trench, and others]. Greek, "in excess and to excess." The glory exceeds beyond all measure the affliction.