Silver City Church Logo

Our Father: The Doctrine of Adoption

Sermon Overview
2 Thessalonians picks up exactly where the first letter left off, continuing the same themes of faith, love, hope, affliction, and holy living with a terser and more focused pen. But the salutation holds a theological surprise most readers pass right over. One word separates it from the opening of 1 Thessalonians: the word our. Not merely God the Father, but God our Father. That single possessive pronoun opens into one of the most underpreached doctrines in the Christian tradition: adoption. God does not simply move sinners from one ledger to another. He takes people of thoroughly bad character out of the gutter and brings them into the mansion as sons and daughters, co-heirs with Christ, loved with the same love the Father has poured out on the Son from eternity. We were never what any family would want to claim. And yet we have been given the name, the inheritance, the Spirit, and the access. That is the Christian life at its core: not a legal transaction that leaves us static, but a family that transforms everything about how we live, how we relate to God, and how we carry ourselves before a watching world.
Key Takeaways
One Word Changes Everything
The shift from "God the Father" in 1 Thessalonians to "God our Father" in 2 Thessalonians is not an accident. The word our carries the full weight of adoption. We are not addressed as subjects of a distant deity. We are addressed as children writing home to a Father who knows us intimately, relationally, and by name.
Justification Clears the Way for Adoption
Justification is the foundational blessing, the legal declaration that we are not guilty. But adoption is the crowning one. God does not leave us as acquitted strangers. He brings us into the family. We are not case files. We are people, and the God who declares us righteous is also the Father who invites us home.
God's Adoption Works Backwards
In Paul's world, wealthy families adopted young men of proven character to carry on the family name. God does the opposite. He adopts people of thoroughly bad character, people who were by nature the very opposite of what any family would want to claim, and makes them heirs of God and co-heirs with Christ.
The Inheritance Is God Himself
We often assume that evidence of God's blessing means accumulation of things. But the inheritance purchased for us in Christ is not stuff; it is God himself, the very thing our first parents threw away in the garden. If we want the blessings but not the Blesser, we are no better than Esau trading a birthright for a bowl of soup.
Discipline Is a Privilege, Not a Punishment
When God corrects us or allows difficulty to grow us, it is not evidence that he has given up on us. It is proof of the opposite. A Father who disciplines loves his children. He is not finished with us. He is running toward us like the father of the prodigal, ring and robe already in hand.
Weekly Devotional
Day 1: In God, Our Father
Scripture: 2 Thessalonians 1:1-2; Ephesians 1:3-6
Theme: Position and Family

The preposition in marks the closest possible personal association: one with, united to, joined inseparably. To be in God our Father is not merely to be on his side or under his protection. It is to be part of his family. Read Ephesians 1 slowly today and count how many times Paul uses the word in tied to a specific blessing. Let the weight of what it means to be in God land somewhere real, not as a doctrine you affirm but as a reality you inhabit.
Day 2: Adopted, Not Merely Acquitted
Scripture: Romans 8:14-17; Galatians 4:4-7
Theme: Adoption

Justification is the legal declaration that we are not guilty. Adoption is what that declaration clears the way for. You are not simply acquitted and released. You have been brought into the household of God, given his name, granted his Spirit, and made a co-heir with Christ. Spend time today sitting with the difference between relating to God as a judge who let you off versus a Father who brought you home. Which of those two pictures more accurately describes how you actually live day to day?
Day 3: The Love the Father Has for the Son
Scripture: John 17:22-24; Romans 8:29-30
Theme: The Depth of the Father's Love

Because we are in Christ, God the Father loves us with the same love he has poured out on his only begotten Son from eternity. Not a lesser version of that love. Not a conditional version. The same love. Read John 17:22-24 slowly and let Jesus' own words make the case. This is not poetry or hyperbole. It is the staggering logic of adoption: if you are in the Son, the Father's love for the Son now extends to you as though you had never sinned against him at all.
Day 4: The Privileges of the Adopted
Scripture: Romans 8:16-17; Psalm 103:13-14
Theme: What Belongs to the Children

Adopted children have access to everything that belongs to the family: forgiveness, the Father's tender care and compassion, freedom in place of slavery, an inheritance once reserved for the firstborn, inclusion in a household stretching across every wall that once divided us, and a final bodily redemption still to come. Walk through those privileges one by one today. Which ones are you actually living in? Which ones have you forgotten you own? Ask God to make each one real and felt in your daily life.
Day 5: Living Like Children, Not Orphans
Scripture: Ephesians 5:1; Hebrews 12:5-11
Theme: Imitating the Father

Children naturally grow to imitate their parents. Spiritual children are called to imitate their heavenly Father: in obedience, in forgiveness, in welcoming discipline as proof of love rather than evidence of absence. It is entirely possible to be a genuine Christian and still walk through life functionally forgetting you are a son or daughter. That forgetfulness changes everything, how you pray, how you respond to hardship, and how you speak of God to others. Who do you need to forgive today as a visible sign of whose family you belong to?
Reflection and Application Questions
  • Reflection: The sermon said justification is the foundational blessing and adoption is the crowning one. In your own experience of the Christian life, which of these has received more emphasis? What changes when adoption moves to the center?
  • Reflection: God's adoption works backwards from how adoption worked in Paul's world: he chooses people of thoroughly bad character rather than those who have proven themselves. What does that inversion say about the nature of grace, and about what God is actually looking for in us?
  • Reflection: The sermon warned against wanting the blessings but not the Blesser. Where in your life are you most tempted to use God as a means to a better outcome rather than pursuing God himself as the inheritance?
  • Application: Make a list of the privileges that belong to you as an adopted child of God: forgiveness, the Father's care, freedom, inheritance, family, and final redemption. Which of these are you not actually living in? Take one and bring it before God in prayer this week.
  • Application: Who do you need to forgive right now? The sermon named forgiveness as a family trait, something we extend because we have received it. Extending it is one of the clearest ways we show whose family we belong to.
  • Application: Spend five minutes today in prayer addressing God simply and specifically as Father, not as a theological category but as a person who loves you. Let that shape the posture and the content of what you bring to him.
Scripture References and Cross-References
  • Main Scripture: 2 Thessalonians 1:1-2
  • Ephesians 1:3-14 - The fullest biblical exposition of what it means to be in God: every spiritual blessing, chosen before the foundation of the world, adopted as sons through Christ, sealed with the Spirit as a guarantee.
  • Romans 8:14-17 - Those led by the Spirit of God are sons of God; we have received the Spirit of adoption by whom we cry Abba, Father, and are heirs of God and co-heirs with Christ.
  • Galatians 4:4-7 - God sent his Son so that we might receive adoption as sons, and the Spirit of his Son into our hearts, crying Abba, Father. You are no longer a slave but a son, and if a son then an heir.
  • John 17:22-24 - Jesus prays that the love the Father has for him would be in those who believe, and that they would behold his glory. The love of adoption is the love of the eternal Trinity extended outward.
  • Hebrews 12:5-11 - The Lord disciplines the one he loves and chastises every son he receives. Discipline is not evidence of abandonment; it is proof of belonging.
  • Luke 15:20-24 - The father of the prodigal sees him from a long way off and runs. The robe, the ring, the feast: adoption fully restored, not merely tolerated.
  • WCF Chapter 12 - All who are justified are graciously made partakers of adoption in and through Christ, given God's name, his Spirit, access to the throne of grace, and sealed as heirs of everlasting salvation.
Westminster Confession Connection

WCF Chapter 12, Of Adoption, gives the church's fullest summary of the doctrine at the heart of this sermon. All those who are justified are graciously made partakers of adoption: they take the name of God upon them, receive the Spirit of adoption, have bold access to the throne of grace, are pitied, protected, provided for, and disciplined by him as a Father, yet never cast off, but sealed until the day of redemption, inheriting the promises as heirs of everlasting salvation. The chapter is brief, but what it contains is staggering in its scope. The Westminster divines, recovering a doctrine that had lain largely dormant for fifteen centuries, pressed the full logic of what it means that God does not merely acquit sinners but adopts them.

This doctrine also connects directly to WCF Chapter 11, Of Justification, since adoption is what justification clears the way for. The legal declaration of righteousness is foundational, but it does not leave us as strangers before a judge. It opens the door into the household of God, where everything belonging to the Son now belongs to those who are in him.

Sermon Resources
1 & 2 Thessalonians