Thesis
Drawing from Galatians 4 and the story of Abraham, Sarah, Hagar, and their sons, this sermon argues that the tension between law and grace is not merely about how we are saved but about how we live every day. When we grow impatient with God's promises and reach for the culturally acceptable or emotionally convenient option — the 'possible' route — we forfeit the impossible things only God can do. True freedom comes not from controlling our own outcomes but from trusting the God who parts seas, brings water from rocks, and keeps every promise He makes.
Key points
- 1
The gospel is not only about how to get to heaven — it is about how life should be lived right now.
- 2
Ishmael represents slavery to self-effort; Isaac represents the freedom that comes from trusting God's impossible promise.
- 3
When we get impatient with God's timing, we reach for the 'possible' route — which always promises much but pays off little.
- 4
God is the God of the impossible — He parts seas, dries up rivers, and brings water from rock — and He calls us to trust that same power in our daily lives.
- 5
Mixing the world's gospel with the gospel of grace — letting grace cover eternity while living by the world's rules day to day — is a contradiction that will never produce what we truly long for.
- 6
God's 'no' is just as loving as His 'yes' — Abraham's plea for Ishmael to be the promised heir shows how deeply we can cling to our own plan and resist God's better one.
- 7
Christ has set us free — the call is to stay free and not return to slavery to law or self-made plans.
Outline
Introduction — The Dog Food Story
The pastor opens with a personal story about eating the family dog's food as a child because he and his father grew impatient waiting for his mother to return with dinner. This sets up the sermon's central image: choosing the available 'possible' and missing the better promise.
Big Idea & the Law vs. Gospel Framework
The pastor introduces the big idea — 'When we choose the possible, we miss the impossible' — and recaps the Galatians theme: the law seems like a manageable checklist, but it was always meant to show us that we cannot make life work on our own. Grace is not just about eternal life; it is the power for how life is lived today.
Galatians 4:21-31 — The Allegory of Hagar and Sarah
Paul's allegory is read and explained: Hagar and Ishmael represent the covenant of law and human effort; Sarah and Isaac represent the covenant of grace and God's promise. The two sons illustrate slavery versus freedom.
Abraham's Story — Impatience and Its Consequences
The pastor traces how Abraham and Sarah, growing impatient with God's promise, chose the culturally acceptable route of producing an heir through Hagar. The plan seemed to solve the problem but created jealousy, relational damage, and a child raised under a false identity — a picture of what happens whenever we pursue the possible in place of God's promise.
The World's Gospel vs. the Real Gospel
The pastor addresses how the world's gospel — including contemporary cultural pressure around sexuality and identity — seeps into the church, offering 'possible' replacements for what God actually says. He argues that God's clear Word on these matters is not unloving but is the most loving thing we can hear, and that mixing grace for eternity with the world's gospel for daily life will always fail.
Psalm 114 — The God of the Impossible
Psalm 114 is read as a celebration of God doing the impossible — parting the Red Sea, dividing the Jordan, bringing water from rock. The pastor applies each miracle practically: we only witness God's impossible power when we are willing to step into the desert with Him rather than retreating to the slavery of our own plans.
Genesis 17 — Abraham Asks for Ishmael
God reappears to Abraham thirteen years after Ishmael's birth and declares that Sarah will bear the true promised son, Isaac. Abraham's plea — 'May Ishmael live under your special blessing' — illustrates how deeply we can love the life we built on our own plan and beg God to bless it. God's loving 'no' and the naming of Isaac ('son of laughter') show that He remembers, He keeps His word, and His timing carries both humor and grace.
Closing Appeal — Galatians 5:1 and the Call to Stay Free
The pastor closes with Galatians 5:1 — Christ has set us free, so stay free — and a C. S. Lewis quote about desire being too weak rather than too strong. He calls the church to stop eating the 'dog food' of the possible, to taste and see that God is good, and previews the next two weeks on the Holy Spirit and Christian community as the practical means of walking in that freedom.
Memorable moments
When we choose the possible, we miss the impossible
the gospel is about how life should be lived right now
You don't get to see water come out of a rock unless you're willing to walk into that desert with him
it would seem that our Lord finds our desires not too strong but too weak. We are half hearted creatures, fooling about with drink and sex and ambition when infinite joy is offered us. Like an ignorant child who wants to go on making mud pies in a slum because he cannot imagine what is meant by the offer of a holiday at the sea. We are far too easily pleased
the grace gets me heaven when I die. The world's gospel is how I live here
God's not being mean, God's being loving
Application
The sermon's 'so what' is a direct challenge to stop settling for the dog food of the possible and start trusting God's impossible promises in the concrete details of daily life — money, relationships, sexuality, time, and identity. The pastor frames this as a two-step response: first, recognize that mixing the world's gospel with genuine faith is self-defeating and will never produce the life God designed for you; second, take God at His Word and step into the desert with Him, because that is the only place where you will see seas part and water come from rock. Practically, this means giving first fruits before fear dictates your budget, pursuing relationships that honor God's design rather than settling for convenience, and bringing your 'Ishmaels' — the plans you have loved and begged God to bless — back to Him with open hands. The pastor also points forward: walking this out requires the power of the Holy Spirit and the presence of God's people, so community is not optional.
