Ephesians 5:17 Meaning: Foolish or Understanding? The Will of the Lord
Therefore, don’t be foolish, but understand what the will of the Lord is.
Wherefore be ye not unwise, but understanding what the will of the Lord is.
Wherefore be ye not foolish, but understand what the will of the Lord is.
because of this become not fools, but--understanding what is the will of the Lord,
For this reason be not foolish, but understanding what [is] the will of the Lord.
Meaning in one sentence
Paul contrasts foolishness with understanding God's will. This verse calls us to practical, daily wisdom, knowing what the Lord desires in each situation.
Context
Paul is near the end of a long section on how to walk as children of light. In the verses just before this one, he told the Ephesians to watch carefully how they live, not as unwise but as wise, making the most of every opportunity because the days are evil. That urgency carries straight into verse 17. The surrounding passage also warns against drunkenness and commands being filled with the Spirit instead. So this little verse sits at a hinge point: it names the central skill of the Christian life. The readers already knew God’s moral will from Scripture and from Paul’s earlier teaching. Now he presses them to move from knowing to understanding, to let that knowledge shape their moment-by-moment choices.
Key Words
The word Paul chose for foolish is aphrōn. It means more than a bad decision now and then. This person lives without moral sense, acting rashly, as if reason itself had left the room. The word carries the image of someone who has unhitched their life from God’s direction. In Ephesus, where drunken orgies of the pagan cults were common, Paul’s readers would have recognized the picture instantly: people who had thrown off restraint and stopped thinking about what is good.
The verb understand is suniēmi. It comes from a root meaning “to bring together.” To understand is to take what you know about God and bring it into the moment you are living right now. Not just to memorize, but to connect. To let God’s will land on today’s decisions: how you spend your afternoon, what you say to your spouse, where you invest your energy.
And the will of the Lord (thelēma kuriou) points to what God wishes to be done, His commands and purposes made known in Scripture and confirmed by the Spirit. This is not a hidden plan you have to guess at. It is the good, acceptable, and perfect will that God has already shown His people.
How Christians Read This Verse
Christians across traditions have read this verse as the heart of practical wisdom. Wesley called it knowing God’s will “in every time, place, and circumstance.” Calvin connected it to meditating on Scripture day and night, so that no obstacle throws you off course. Gill distinguished between God’s secret will (unknown until it happens) and His revealed will (the commands and promises we can act on). The Cambridge Bible emphasizes that this understanding comes not from human reason alone but from a soul awake to God, an illuminated perception that sees how to live in submission to His will. All agree: the wisdom Paul is after is not abstract knowledge but a life that lines up with God’s desires.
A common misunderstanding
Some read “foolish” as if Paul were talking about low intelligence or a lack of education. In fact, the Greek word aphrōn describes someone who has unmoored their life from moral truth, acting without reflection, as if God’s ways did not matter. You can be brilliant in your field and still foolish in this sense. Understanding God’s will starts with humility and obedience, not with IQ.
Living This Out
This week, you will face a dozen small decisions where no Bible verse seems to give the answer. Do I say yes to this extra commitment? How do I spend an unexpected free hour? Where do I draw the line in a conversation that is turning sour? Paul’s command is to stop and bring together what you already know about God with this exact moment. You do not need a special revelation. You need to pause, ask what the Lord wants, honesty, kindness, generosity, holiness, and choose that. The wise life is lived one ordinary choice at a time.
Main takeaway: True wisdom is not knowing more facts but discerning what the Lord wants in each moment, and living it.
For Families
For ages 5, 8
Being foolish means not thinking about what God wants. When you share a toy or listen to your parents, you are understanding what pleases God. That is being wise.
For ages 9, 12
Paul says don’t be foolish, understand what the Lord wants. That means when you have a choice, like whether to tell the truth or take a shortcut, you stop and ask: what does God want me to do? It is not always easy, but God promises to help you see it. Even big decisions start with small, honest steps.
Questions People Ask
What does the Greek word for 'foolish' mean in Ephesians 5:17?
The word is aphrōn, which describes someone who lives without moral sense or reason. It is not about low intelligence but about ignoring God's guidance and acting rashly. Paul warns against that kind of spiritual dullness.
How can I practically 'understand the will of the Lord' in my daily life?
Start with what God has already revealed in Scripture, commands like honesty, kindness, and purity. When you face a decision, pause and ask which choice lines up with those commands. Prayer and wise counsel help. Understanding is not guessing; it is applying what you already know to the moment at hand.
Does this verse mean I need to know God's specific plan for every decision, like which job to take or whom to marry?
Not necessarily. Paul is speaking about the everyday wisdom of walking with God, especially in how we use our time (verse 16). For major decisions, Christians have sought guidance through Scripture, prayer, wise advice, and circumstances. But this verse emphasizes that understanding God's will often comes through obeying what is already clear.
How does 'redeeming the time' in verse 16 connect with understanding the will of the Lord in verse 17?
The two verses are directly linked. Redeeming the time means making the most of every opportunity because the days are evil. To do that wisely, you need to understand what God wants in each situation. Without that understanding, you waste your days on empty pursuits.
What is the difference between being 'unwise' in verse 15 and 'foolish' in verse 17?
In verse 15, Paul uses a different Greek word (asophos) for 'unwise', it means lacking practical wisdom. In verse 17, 'foolish' (aphrōn) is stronger: it means senseless, without moral reason. The first is a lack of skill; the second is a failure of character. Paul urges believers to move from unwise but teachable to actively understanding God's will.
For pastors & researchers
Greek interlinear, 8 commentaries & word study