John Gills Exposition of the Bible Commentary

Verse 17 (Ephesians 5:17)

Wherefore be ye not unwise ,.... No one would be thought to be unwise, but such are, who do not redeem time, and are ignorant of the will of the Lord; believers should not act the unwise part, neither in their talk, nor in their walk and conversation, nor in their use of time:

but understanding what the will of the Lord is ; or "of God", as read the Alexandrian copy, the Vulgate Latin, Syriac, and Ethiopic versions: there is the secret will of God, which is the rule of all his proceedings; and is unknown to men, till facts make it appear; this is always fulfilled, and sometimes by persons who have no regard to his revealed will; to this the wills of the people of God should be always resigned: and there is his revealed will, which lies partly in the Gospel; which declares it to be his will, that Christ should work out the salvation of his people, which is what he came to do; that whoever believes in him shall be saved; that all that are redeemed shall be sanctified; and that they shall persevere to the end, and be glorified; and partly in the law, in the precepts and commands of it, which contain the good, perfect, and acceptable will of God: and the understanding of it is not a mere speculative knowledge of it, but a practical one; when a man not only knows, but does the will of God, and his heart and actions agree with it; and this is to be done in faith, in virtue of grace and strength received, with a view to the glory of God, having no dependence on what is done; and to the right understanding of it, so as to act according to it, as should be, the word of God, and the illuminations, instructions, and grace of the Spirit, are necessary: the Alexandrian copy, Syriac, Arabic, and Ethiopic versions, read the words as an exhortation, "understand ye the will of God".

- John Gills Exposition of the Bible Commentary