Jamieson, Fausset and Brown on 1 Corinthians 6:5

5. your shame--Thus he checks their puffed-up spirit (1Co 5:2; compare 1Co 15:34). To shame you out of your present unworthy course of litigation before the heathen, I have said (1Co 6:4), "Set the least esteemed in the Church to judge." Better even this, than your present course.

Is it so?--Are you in such a helpless state that, &c.?

not a wise man--though ye admire "wisdom" so much on other occasions (1Co 1:5, 22). Paul alludes probably to the title, "cachain," or wise man, applied to each Rabbi in Jewish councils.

no, not one--not even one, amidst so many reputed among you for wisdom (1Co 3:18; 4:6).

shall be able--when applied to.

brethren--literally, "brother"; that is, judge between brother and brother. As each case should arise, the arbitrator was to be chosen from the body of the church, such a wise person as had the charism, or gift, of church government.