{But let us also rejoice in our tribulations} (alla kai
kauch(936d)etha en tais thlipsesin). Present middle subjunctive of
same verb as in verse  2 . Kauch(936d)ai is more than "rejoice,"
rather "glory," "exult." These three volitive subjunctives
(ech(936d)en, kauch(936d)etha, twice) hold up the high ideal for the
Christian after, and because of, his being set right with God. It
is one thing to submit to or endure tribulations without
complaint, but it is another to find ground of glorying in the
midst of them as Paul exhorts here.