Not convenient; not proper, not consistent with your Christian profession.
Who is an idolater; worshipping money as his god.
Vain words; vain and false excuses for such sins.
Sometime darkness; some time in darkness.
Are made manifest; their character is made manifest. The idea is that Christians should let their light--that is, their example of holiness and purity--shine; as this light would be the means of putting the wickedness of the heathen to shame.
Expressions analogous to these are found in Isaiah 26:19,60:1-3.
Of the body; that is, of his body, the church. The application intended to be made of this is expressed in Ephesians 5:25.
This is a great mystery; that is, the love of Christ for the church, typified by that due from the husband to the wife; called a mystery, because it remained so long unrevealed. (Compare Ephesians 1:9.)
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Abbott, John S. C. & Abbott, Jacob. "Commentary on Ephesians 5". "Abbott's Illustrated New Testament". https://www.studylight.org/
the Third Week after Easter