“Therefore do not be foolish, but understand what the will of the Lord is” (v17). In practical terms, Paul said that believers must reject the crude language, sexual immorality, drunkenness and greed of their past lives. Instead, they should cultivate hearts of joy and thanksgiving, quick to sing and worship, “submitting to one another out of reverence to Christ” (v21). Following Jesus changes things at the family level, too, with husbands following Christ’s example of humble and self-sacrificial leadership (v25-33).
“Look carefully then how you walk, not as unwise but wise …” (v15). Saved by Christ and made new by His Spirit, we are capable of speaking and behaving according to His will.