Ефесянам 5:10

Proving--construed with "walk" (Eph 5:8; Rom 12:1-2). As we prove a coin by the eye and the ear, and by using it, so by accurate and continued study, and above all by practice and experimental trial, we may prove or test "what is acceptable unto the Lord." This is the office of "light," of which believers are "children," to manifest what each thing is, whether sightly or unsightly.

We had several important exhortations in the close of the foregoing chapter, and they are continued in this: particularly, I. We have here an exhortation to mutual love and charity (Eph 5:1, Eph 5:2). II. Against all manner of uncleanness, with proper arguments and remedies proposed against such sins: and some further cautions are added, and other duties recommended (v. 3-20). III. The apostle directs to the conscientious discharge of relative duties, from Eph 5:21, throughout this, and in the beginning of the next chapter.

5:10 Carefully determine what pleases the Lord: The point is to obey God’s will, not simply to understand it (cp. Rom 12:2; Phil 1:10).