One in Christ
Christ gathers one flock under one Shepherd, and all who belong to Him are joined to one body, sharing one hope: eternal life with Him.
On This Lesson
Prepare for This Lesson Purpose, learning goals, key Scriptures, and preparation
What You Will Learn
- How Jesus gathers one flock under one Shepherd, from Israel and from every nation
- How Christ breaks down the dividing wall and brings those who were far away near
- What union with Christ means, and how believers become children of God led by the Spirit
- How Christ's one body shares one hope: eternal life with Him
- What it means to share in Christ at the Lord's Table, and why it must be received with reverence
Key Scriptures
- John 10:16; Luke 12:32
- Ephesians 2:12–16; Galatians 3:26–29
- Galatians 2:20; John 15:4–5; Romans 8:9, 14, 16
- 1 Corinthians 12:13, 27; Ephesians 4:4–6
- John 6:53–56; 1 Corinthians 10:16–17; 1 Corinthians 11:26–29
1. Jesus Gathers One Flock
Jesus first came among the people of Israel and called disciples to follow Him. He said:
"I was sent only to the lost sheep of the house of Israel."Matthew 15:24
Yet His saving work was never meant to remain only within Israel:
"I have other sheep that are not of this fold; I must bring them also, and they will listen to My voice; and they will become one flock, with one shepherd."John 10:16
The flock began small:
"Do not be afraid, little flock, because your Father has chosen to give you the kingdom."Luke 12:32
His disciples were few and weak in the eyes of the world, but the Father was pleased to give them the Kingdom. The other sheep would also hear Christ's voice and be brought into the same flock.
2. Christ Breaks the Wall and Brings the Nations Near
The promise of one flock began to unfold as the Gospel went beyond Israel to Samaritans and to the nations. When God welcomed Cornelius and his household, Peter said:
"I most certainly understand now that God is not one to show partiality, but in every nation the one who fears Him and does what is right is acceptable to Him."Acts 10:34–35
Israel was the people God had formed through His covenant, while the nations were outside that covenant family. Scripture says:
"You were at that time separate from Christ, excluded from the people of Israel, and strangers to the covenants of the promise."Ephesians 2:12
But through Christ, those who were far away were brought near:
"Now in Christ Jesus you who previously were far away have been brought near by the blood of Christ."Ephesians 2:13
This is the meaning of the one flock: through Christ, the wall is broken, those who were far away are brought near, and Jews and Gentiles are reconciled in one body.
"He Himself is our peace, who made both groups into one and broke down the barrier of the dividing wall."Ephesians 2:14
"That He might reconcile them both in one body to God through the cross."Ephesians 2:16
Scripture also says:
"For you are all sons and daughters of God through faith in Christ Jesus. For all of you who were baptized into Christ have clothed yourselves with Christ. There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus. And if you belong to Christ, then you are Abraham's descendants, heirs according to promise."Galatians 3:26–29
3. Revelation Shows the Fullness of God's People
Revelation uses symbolic and heavenly language to show God's redeemed people gathered around the Lamb. Scripture says:
"I heard the number of those who were sealed, 144,000, sealed from every tribe of the sons of Israel."Revelation 7:4
Then John saw:
"A great multitude which no one could count, from every nation and all the tribes, peoples, and languages, standing before the throne and before the Lamb."Revelation 7:9
John hears the number of the sealed people and then sees a multitude too great to count. These visions belong together. Later, Scripture says:
"The Lamb was standing on Mount Zion, and with Him 144,000 who had His name and the name of His Father written on their foreheads."Revelation 14:1
4. Life in Union With Christ
At the heart of Christian life is union with Jesus Christ. Scripture says:
"I have been crucified with Christ; and it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself up for me."Galatians 2:20
"Christ in you, the hope of glory."Colossians 1:27
"For to me, to live is Christ."Philippians 1:21
Jesus described this union through the picture of a vine and its branches:
"Abide in Me, and I in you. Just as the branch cannot bear fruit of itself but must remain in the vine, so neither can you unless you remain in Me. I am the vine, you are the branches; the one who remains in Me, and I in him bears much fruit, for apart from Me you can do nothing."John 15:4–5
Just as a branch cannot live apart from the vine, a Christian cannot have true spiritual life apart from Christ.
"Whoever confesses that Jesus is the Son of God, God remains in him, and he in God."1 John 4:15
5. Children of God, Led by the Spirit
Union with Christ is not merely outward. Through Him, believers receive new life and become children of God. Scripture says:
"As many as received Him, to them He gave the right to become children of God."John 1:12
"See how great a love the Father has given us, that we would be called children of God; and in fact we are."1 John 3:1
Those who belong to Christ also receive His Spirit:
"If anyone does not have the Spirit of Christ, he does not belong to Him."Romans 8:9
The Holy Spirit assures believers that they are God's children and leads them in His way:
"The Spirit Himself testifies with our spirit that we are children of God."Romans 8:16
"For all who are being led by the Spirit of God, these are sons and daughters of God."Romans 8:14
The Spirit draws us closer to Christ and changes the way we live. Jesus said of the Spirit:
"He will glorify Me."John 16:14
Scripture therefore calls us to:
"Walk by the Spirit, and you will not carry out the desire of the flesh."Galatians 5:16
"Put on the new self, which in the likeness of God has been created in righteousness and holiness of the truth."Ephesians 4:24
6. One Body, One Hope in Christ
Those who are united with Christ belong to Him. Scripture says:
"The one who joins himself to the Lord is one spirit with Him."1 Corinthians 6:17
Belonging to Christ also joins us to His people:
"By one Spirit we were all baptized into one body."1 Corinthians 12:13
"You are Christ's body, and individually parts of it."1 Corinthians 12:27
Christ has one body with many members, and all who belong to Him share the same hope. Scripture says:
"There is one body and one Spirit, just as you also were called in one hope of your calling; one Lord, one faith, one baptism, one God and Father of all."Ephesians 4:4–6
The Christian hope is not divided. All who belong to Christ share one hope: to be with Him forever. Jesus said:
"I will come again and receive you to Myself, so that where I am, there you also will be."John 14:3
Scripture says:
"We will always be with the Lord."1 Thessalonians 4:17
"Behold, the tabernacle of God is among the people, and He will dwell among them."Revelation 21:3
7. Christ Gives His Flesh and Blood for Life
Jesus spoke with great seriousness about sharing in His life. He said:
"Unless you eat the flesh of the Son of Man and drink His blood, you have no life in yourselves." "The one who eats My flesh and drinks My blood has eternal life, and I will raise him up on the last day." "My flesh is true food, and My blood is true drink." "The one who eats My flesh and drinks My blood remains in Me, and I in him."John 6:53–56
This teaching was difficult for many:
"As a result of this many of His disciples left, and would no longer walk with Him."John 6:66
Jesus did not take back His words or make them unimportant. He asked the Twelve:
"You do not want to leave also, do you?"John 6:67
Peter answered:
"Lord, to whom shall we go? You have words of eternal life."John 6:68
8. We Share in Christ and Discern His Body
Jesus gave His disciples the holy meal of the new covenant. He said:
"This is My body, which is being given for you; do this in remembrance of Me."Luke 22:19
"This cup, which is poured out for you, is the new covenant in My blood."Luke 22:20
Scripture says:
"Is the cup of blessing which we bless not a sharing in the blood of Christ? Is the bread which we break not a sharing in the body of Christ?"1 Corinthians 10:16
"Since there is one bread, we who are many are one body; for we all partake of the one bread."1 Corinthians 10:17
The Lord's Table points to Christ's death, communion with Him, and the unity of His people.
"As often as you eat this bread and drink the cup, you proclaim the Lord's death until He comes."1 Corinthians 11:26
Because this meal is holy, it must be received with reverence:
"Whoever eats the bread or drinks the cup of the Lord in an unworthy way, shall be guilty of the body and the blood of the Lord." "A person must examine himself." "He who eats and drinks, eats and drinks judgment to himself if he does not properly recognize the body."1 Corinthians 11:27–29
Key Truth
Jesus gathers one flock under one Shepherd.
Through His cross, those who were far away are brought near and reconciled in one body.
All who belong to Christ receive life in Him, become children of God, and are led by His Spirit.
Christ has one body, and all His people share one hope: eternal life with Him.
At the Lord's Table, believers share in Christ, proclaim His death, and recognize their unity as His body.
Union with Christ calls us to repentance from sin and sincere communion with Him and His body. It is not merely a religious identity, but life in the crucified and risen Lord.
Check Your Understanding
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Multiple choice: In John 10:16, what does Jesus say will happen to His "other sheep"?
Show suggested answer
B. Jesus says the other sheep "will listen to My voice; and they will become one flock, with one shepherd." Christ gathers all who hear His voice into one flock under Himself.
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True or false: According to Ephesians 2:14–16, Christ's cross created two separate reconciled groups rather than one new body.
Show suggested answer
False. Ephesians 2:14–16 says Christ "made both groups into one and broke down the barrier of the dividing wall," reconciling "them both in one body to God through the cross." Christ joins believers into a single body, not two parallel ones.
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Scripture connection: How does John 15:4–5 use the picture of a vine and branches to describe union with Christ?
Show suggested answer
Jesus says He is the vine and believers are the branches. Just as a branch cannot bear fruit — or live — apart from the vine, a Christian cannot have true spiritual life or bear fruit apart from remaining in Christ.
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In your own words: Why does Paul say the Lord's Table must be received with self-examination and reverence (1 Corinthians 11:27–29)?
Show suggested answer
Because the bread and cup are a sharing in the body and blood of Christ and a proclamation of His death, receiving them carelessly or while knowingly living apart from Him treats what is holy as ordinary. Paul calls believers to examine themselves and to return to Christ in faith and repentance before sharing at His table.
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Personal response: Ephesians 4:4–6 describes "one hope," "one Lord," "one faith." Where do you see division rather than unity in your own attitudes toward other believers, and how might remembering Christ's one body change that?
Show suggested answer
There is no single correct answer. This question invites honest reflection on pride, suspicion, or distance toward other believers, and an invitation to remember that Christ is not divided and that all who belong to Him share one hope.
Review
- What does John 10:16 say Jesus will do with His "other sheep"?
- How does Ephesians 2:13–16 describe what Christ did for those who were "far away"?
- What does Galatians 2:20 mean by being "crucified with Christ"?
- According to Romans 8:14–16, how does the Holy Spirit relate to being a child of God?
- What does 1 Corinthians 12:13 say about how believers are joined into one body?
Reflection Questions
- What does it mean that Christ gathers "one flock" from every background and nation?
- Where in your own life or church experience have you seen walls that Christ's cross is meant to break down?
- What does the picture of the vine and branches teach you about depending on Christ day by day?
- How does the Holy Spirit lead you, and how do you know you are being led by Him rather than by the flesh?
- What does it mean personally to share in Christ at His table with reverence and self-examination?
After This Lesson
Read Ephesians 4:1–6 slowly and ask God to show you one practical way to walk in the unity He has already made among His people.
Before moving on, pause. Pray. Thank the Father for bringing you near through the blood of Christ, and ask Him to make you truly one with Christ and with His body — in faith, humility, and love.
"Father, keep me in Christ, and make me one with His people."