Walk in wisdom toward them that are without, redeeming the time.
In wisdom - practical, Christian. (Notes, Ephesians 5:15-16)
Them that are without - those not in the Christian brotherhood (1 Corinthians 5:12; 1 Thessalonians 4:12). The brethren, through love, will make allowance for indiscretion in a brother; the world will make none. Be the more on your guard in contact with the latter. Give no pretext for unbelief. Contrive all means for their salvation.
Redeeming the time (note, Ephesians 5:16) - buying up for yourselves, and buying off from worldly vanities, the opportunity, whenever afforded you, of good to yourselves and others. 'Forestall the opportunity - i:e., buy up an article out of the market, to make the largest profit from it' (Conybeare).