Jamieson, Fausset & Brown

(See on Eph 5:15-16.) in wisdom--practical Christian prudence. them . . . without--Those not in the Christian brotherhood (Co1 5:12; Th1 4:12). The brethren, through love, will make allowances for an indiscreet act or word of a brother; the world will make none. Therefore be the more on your guard in your intercourse with the latter, lest you be a stumbling-block to their conversion. redeeming the time--The Greek expresses, buying up for yourselves, and buying off from worldly vanities the opportunity, whenever it is afforded you, of good to yourselves and others. "Forestall the opportunity, that is, to buy up an article out of the market, so as to make the largest profit from it" [CONYBEARE and HOWSON].