Therefore do not be foolish, but understand what the Lord’s will is.
As if he had said, "Seeing the times are so perilous, and your opportunities of doing good so uncertain, be wise, and understand what are the proper duties of your place and station, and know how to manage yourselves in every relation, with reference to the duties, dangers, snares, and temptations, which may be before you, and this according to the will of God revealed in his word.
These vile lusts were rife among pagans and must be cut out by the roots. Do not name them as though they were acceptable; hate them utterly as befit the saints. Guard even against foolish talking and jesting that cheapen what is holy.
AI summary
Commenting on Ephesians 5:3-20
Verse 17. Be ye not unwise. Be not fools in the employment of your time, and in you manner of life. Show true wisdom by endeavouring to understand what the will of the Lord is, and then doing it. (*) "unwise" "inconsiderate" (c) "the will"