Introduction — The Mystery Made Known

A Series Introduction

Before we open the letter tomorrow, today is our orientation day. Ephesians is short — only six chapters — but it is one of the most exalted things Paul ever wrote. It reads less like an argument and more like a hymn: a serene, soaring meditation on the whole plan of God, from before the foundation of the world to the day when all things are gathered up in Christ. It deserves a running start. Today we set the stage — who wrote it, from where, why, and how it unfolds — so that everything after lands with greater weight.

Pray to Begin

Ask — that the Holy Spirit, who moved Paul as he wrote from a prison cell, would now open this letter to you; that He would give you eyes to see the height and depth of what God has done.

Give thanks — for a salvation you did not design and could not earn; and that the same letter that has lifted the church’s gaze for two thousand years is now open before you.

Yield — every small and anxious picture of God you have carried, and ask Him to enlarge it — to show you the vast and settled plan into which He has drawn you.

Today’s Passage — An Overview of the Whole Letter

Ephesians is a letter, written by the apostle Paul while he was a prisoner — he calls himself “the prisoner of Christ Jesus” (Ephesians 3:1) and “a prisoner in the Lord” (Ephesians 4:1) — most likely from Rome, around AD 60–62. Unlike most of his letters, it was not written to put out a fire. There is no scandal to correct, no false teacher to refute, no crisis in view. Paul simply lifts his eyes and, for six chapters, contemplates the eternal purpose of God and what it means to be caught up in it.

There is a curious detail worth knowing at the outset. Many of the earliest and best manuscripts of the letter do not contain the words “in Ephesus” in the opening line. This has led many scholars to think Ephesians was a circular letter — written to be carried from church to church around Ephesus and the surrounding region, read aloud in one congregation and then passed to the next. That would explain its unhurried, universal tone. Paul is not addressing one church’s particular troubles; he is unfolding truth meant for the whole people of God, in every place. Which means it was written, in a real sense, for us.

Here is how he opens, and notice how quickly he lifts off the ground:

"Paul, an apostle of Christ Jesus by the will of God, To the saints in Ephesus, the faithful in Christ Jesus: Grace and peace to you from God our Father and the Lord Jesus Christ. Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly realms." Ephesians 1:1–3 (BSB)

Two verses of greeting, and Paul is already among the stars — “every spiritual blessing in the heavenly realms.” That upward reach is the whole letter in miniature.

The letter falls cleanly into two halves, and seeing this now will keep you oriented the whole way through. Chapters 1–3 tell you who you are in Christ — chosen before the foundation of the world, redeemed, sealed with the Spirit, made alive when you were dead, brought near when you were far off, joined into one new humanity, built into a temple where God Himself dwells. It is pure doctrine, and it is breathtaking. Then chapters 4–6 tell you how to walk because of it — in unity, in holiness, in the home, in the workplace, and finally clothed in the armor of God against unseen powers. The hinge between the two halves is a single word at Ephesians 4:1: “walk.” Everything Paul believes turns, at that verse, into how Paul lives.

Original Language: The Plan and the Walk

Two Greek words hold the two halves of Ephesians together. Learn them now, and you will feel the letter’s architecture from the inside.

The first belongs to the soaring first half. It is οἰκονομία (oikonomia), pronounced oy-ko-no-MEE-ah. Strong’s G3622. It is the word for the management of a household — the ordered plan by which a steward runs a great estate. From it we get our English word economy. Paul uses it to name the grand design of God: God has a plan — administered, purposed, unfolding on schedule — “to bring all things in heaven and on earth together in Christ” (Ephesians 1:10). The whole of history, all its scattered pieces, is being gathered under one head. When Paul says God made known “the mystery of His will” (1:9) and set out to “illuminate for everyone the stewardship [oikonomia, oy-ko-no-MEE-ah] of this mystery” (Ephesians 3:9), he means that what was hidden for ages is now revealed: the eternal household of God, ordered around His Son. Ephesians is the letter of the oikonomia — the plan behind everything.

The second word belongs to the second half, and it is humbler and closer to the ground. It is περιπατέω (peripateō), pronounced peh-ree-pa-TEH-oh. Strong’s G4043. It means, simply, to walk — but Paul uses it as a picture of the whole conduct of a life, step after ordinary step. It governs chapters 4–6 like a drumbeat: “walk in a manner worthy” (4:1), walk no longer as the world walks, walk in love, walk as children of light, walk carefully and wisely. The vast oikonomia (oy-ko-no-MEE-ah) of chapters 1–3 comes down, at last, to a peripateō (peh-ree-pa-TEH-oh) — a walk. Heaven’s eternal plan is meant to be lived out in the way you move through Tuesday.

Hold the two words together and you have the shape of the whole book: God has an eternal plan, and you have a daily walk — and the second flows entirely out of the first.

Historical & Cultural Context

Authorship. Ephesians presents itself as the work of the apostle Paul (Ephesians 1:1; 3:1), and the church has received it as his from the earliest days. Paul was a Pharisee of rigorous training, stopped in his tracks by the risen Christ on the Damascus road, and sent as the apostle to the Gentile world. By the time of this letter he is an older man, seasoned by years of mission and now in chains for the gospel.

Date and place. Ephesians is one of the four so-called Prison Epistles (with Philippians, Colossians, and Philemon), written while Paul was under guard — most likely during his imprisonment in Rome around AD 60–62. It shares much of its language and thought with Colossians, written about the same time; the two letters are close companions. That Paul could compose something this serene while in custody is itself part of the message: the man who writes of being “seated with [Christ] in the heavenly realms” (Ephesians 2:6) is, as he writes, sitting in a Roman prison.

The setting. Ephesus was a great port city of the Roman province of Asia, famous for its temple of Artemis and saturated with magic, idolatry, and the fear of unseen spiritual powers. That world hums beneath the letter. When Paul insists that Christ is exalted far above every rule and authority, and that the church’s real “struggle is not against flesh and blood, but against… the spiritual forces of evil in the heavenly realms” (Ephesians 6:12), he is speaking directly to people who felt the pressure of those powers every day. To them — and to us — he announces a Christ who reigns over all of it.

Study Notes

A few threads run through the whole letter; watch for them from the first chapter.

• “In Christ.” This little phrase is the heartbeat of Ephesians, sounding some thirty times — in Christ, in Him, in the Beloved. Every blessing Paul names is located there: we are chosen, redeemed, sealed, made alive, and seated, all in Christ. Whenever you see it, slow down — you are standing at the center of Paul’s world.
• The heavenly realms. Five times Paul lifts our gaze to “the heavenly realms” — the unseen sphere where Christ is enthroned, where we are already seated with Him (Ephesians 2:6), and where the real spiritual battle is waged (6:12). Ephesians insists that the deepest truths about you are decided in a place your eyes cannot see.
• The mystery: one new humanity. The great secret now revealed is that Jew and Gentile are made one in Christ — “one new man out of the two” (Ephesians 2:15), “brought near through the blood of Christ” (2:13). The dividing wall is gone. The church is God’s demonstration, to the whole cosmos, of what His reconciling plan can do.
• The church, under four pictures. Watch how many ways Paul describes God’s people: a body joined to its head, a temple where God dwells by the Spirit, a bride loved by Christ who gave Himself for her (Ephesians 5:25), and an army standing in God’s armor. No New Testament letter thinks more highly of the church than this one.

The map of the letter

Ephesians falls into a clear and deliberate shape. Keep it in view and you will never be lost:

• Chapters 1–3 — Who we are in Christ (doctrine). The soaring account of God’s eternal plan: chosen before the foundation of the world, redeemed and forgiven, sealed with the Spirit as a guarantee; then dead in sin but made alive by grace through faith; then Jew and Gentile joined into one new humanity, a temple God inhabits. It closes with Paul on his knees, praying that we would grasp a love too vast to measure.
• Chapters 4–6 — How we walk because of it (life). “Walk in a manner worthy” (4:1). Unity in the body, the putting off of the old self and the putting on of the new, holiness of speech and life, love in marriage and the household, honest work — and finally the full armor of God for the unseen war. Doctrine becomes a doorstep.

The turn between them, at Ephesians 4:1, is everything. Chapters 1–3 are therefore; chapters 4–6 are what follows from it.

The Thesis: Ephesians 1:9–10 and 2:8–10

If Ephesians has a beating heart, it beats in two places — one showing the plan, the other showing the grace that draws us into it.

Here is the plan:

"And He has made known to us the mystery of His will according to His good pleasure, which He purposed in Christ as a plan for the fullness of time, to bring all things in heaven and on earth together in Christ." Ephesians 1:9–10 (BSB)

There it is: the oikonomia (oy-ko-no-MEE-ah), the great household plan of God — to gather everything, in heaven and on earth, into one under Christ. History is not adrift. It is being drawn to a single point.

And here is how we, personally, are brought inside it:

"For it is by grace you have been saved through faith, and this not from yourselves; it is the gift of God, not by works, so that no one can boast. For we are God's workmanship, created in Christ Jesus to do good works, which God prepared in advance as our way of life." Ephesians 2:8–10 (BSB)

Read those three verses slowly. Salvation is by grace — God’s undeserved favor. It comes through faith — received, not achieved. It is the gift of God — so no one can boast. And it does not stop there: we are God’s workmanship, made new for good works He prepared beforehand. Grace saves us from works as a way of earning; grace then saves us for works as a way of living. That is the whole gospel of Ephesians in three sentences.

A word about being chosen. Ephesians opens by saying God “chose us in Him before the foundation of the world” (1:4) and “predestined us for adoption as His sons” (1:5). Some readers meet those words with anxiety, as if they name a locked door. Paul means the opposite. He offers this not as a puzzle to argue but as a comfort to rest in: your place in God’s family does not hang on the strength of your grip on Him, but on the strength of His grip on you, formed before the world began. And to seal it, God has given His own Spirit as a down payment — “you were sealed with the promised Holy Spirit, who is the pledge of our inheritance” (Ephesians 1:13–14). A seal marks ownership; a pledge guarantees what is still to come. Whatever remains unresolved in these deep waters, this much is meant for your peace: the God who began His plan before time will not abandon it in you.

Personal Application

Three things to carry as we begin this letter:

1. Look up before you look in. Ephesians spends three whole chapters telling you what is true before it asks you to do anything. Where, honestly, do you begin with the doing — with performance, effort, the anxious ledger of how you are measuring up? What might change in an ordinary day if you first let yourself be told, at length, all that God has already done and settled?

2. The plan is bigger than your part in it. Paul was in prison, yet he wrote of a design that gathers up all things in heaven and earth. When your own circumstances feel small, stuck, or out of your hands, how would it steady you to remember that you have been drawn into a plan far larger than your visible situation — and that nothing in your life falls outside it?

3. Let the plan become a walk. All of this soaring truth is heading somewhere very concrete: the way you speak, work, forgive, and love. Where is one place this week that the vast grace of chapters 1–3 could show up as a single, ordinary, worthy step in chapters 4–6?

Pray to Close

The central truth as we begin: God has one eternal plan — to gather all things together in Christ — and by sheer grace He has drawn you inside it, saved not by your works but as His own workmanship, sealed by His Spirit, and now called to walk it out. Ephesians is the unhurried unfolding of that one purpose.

Praise — God for a plan older than the world and wider than the heavens, and for the grace that made a place in it for you.

Confess — every anxious attempt to earn what He gives, and every small picture of God that has kept you from resting in how securely you are held.

Ask — that over these next weeks the Spirit would lift your eyes to see who you are in Christ, and then bring it all down to earth in a worthy walk — step after ordinary step.