Christians are called to grow. When God saves us, He doesn’t just forgive us and leave us where we are—He starts changing us. The Bible calls that sanctification. Paul says in 1 Thessalonians 4:3, “For this is the will of God, your sanctification.” In other words, this isn’t something extra for super-Christians. This is God’s will for every believer.
Now, we need to be clear right away—we are not saved by our obedience. We don’t become Christians by trying harder or cleaning ourselves up. Ephesians 2:8–9 is clear: “For by grace you have been saved through faith… not a result of works, so that no one may boast.” Salvation is a gift. Nothing we earn. Nothing we deserve. But it doesn’t stop there. God saves us for a purpose. Right after that, Ephesians 2:10 says we are His workmanship, created in Christ Jesus for good works. So yes—we’re not saved by works, but we are saved for them. God begins a real work in us, shaping our lives as we follow Him. And over time, that change shows.
A Christian is someone who’s been genuinely changed by God. Not perfect, but different. Sanctification is just the daily process of God setting us apart and slowly shaping us into the image of Christ. It’s the Holy Spirit doing work in us we could never do on our own. That’s where Romans 12 comes in. After eleven chapters of explaining the gospel and justification by faith, Paul turns the corner. He basically says, “In light of all of this—this is how you should live.” It’s where belief starts showing up in real life.
1. Be Motivated by His Mercy
At the beginning of verse one, the Apostle says, “I appeal to you therefore brothers… by the mercies of God.” The term “therefore” is crucial. It anchors this call to the preceding eleven chapters, emphasizing that sanctification is not an independent endeavor, but a grateful response to God’s immeasurable mercy demonstrated in the gospel. Paul here is urging a sanctified life in light of, or “in view of God’s mercy.”
Prior to this verse, Paul has mentioned the mercy of God ten times. Mercy is God sparing us from what we do deserve (death), and grace is giving us what we do not deserve (eternal life in Christ). God’s compassion has been described in detail: we all “sinned and fall short of the glory of God” (3:23), yet “while we were yet sinners, Christ died for us” (5:8). Finally, “the wages of sin is death but the gift of God is eternal life through Jesus Christ our Lord” (6:23).
This incredible act of God’s grace in Christ, freely offering salvation to a people utterly undeserving, becomes the bedrock for the Christian life. What should our response be? The answer is devotion. As Charles Spurgeon noted, “Once our hearts are touched by God’s mercy, we must realize we are no longer our own, but have been bought with a price.” [^1]
2. Surrender to His Authority Completely
In verse one, Paul tells us to “present your bodies as a living sacrifice” as our ongoing worship. This presentation is something that we do both once and for all as well as day by day. If He is my Lord, then He must be my Lord every day. The word “bodies” represents the totality of one’s life and activities.
What does God want from my life? He wants your whole life. He does not want ten percent, or fifty percent, or ninety-nine percent. He wants all there is of you. Every fiber of our being, every word from our lips, every thought from our minds, and every action from our bodies should be offered to The Lord as an act of Holy and acceptable worship to Him.
This is not legalism; it is simply the pursuit of Holiness and obedience. Legalism is when you and I follow external, extrabiblical rules to try and gain favor with God. Seeking to live a sanctified life is when you and I surrender ourselves to the Lord in obedience because He so graciously saved us.
There is a story of a woman who asked her pastor what it meant to be a living sacrifice. Holding out a blank sheet of paper, the pastor replied, “It is to sign your name at the bottom of this blank sheet, and let God fill it in as He wills.” [^2]
To offer our bodies as a “living sacrifice” is a bit of a paradox, for sacrifices are normally killed. But Paul is emphasizing that Christian discipleship is a constant, daily surrender of our wills, desires, and energies to the service of God. Paul says this total sacrifice is our “spiritual worship”—the logical, worshipful reaction for someone that has truly experienced the marvelous mercies of God.
3. Renew Your Mind Intentionally
The first half of verse two shows that the person who has truly sacrificed himself to God will be distinguished by one overriding characteristic: the unwillingness to be conformed to the pattern of this world. The “world” refers to an entire system of values, priorities, and philosophies that are opposed to God’s—a culture that embraces self-centeredness and immediate gratification.
To be conformed to this pattern means allowing worldly values to shape our thoughts, attitudes, and actions. This conformity can be subtle, like a slow leak, if we are not intentional.
So how do we combat the temptations of this world? Paul says we need to be “transformed” (the Greek word metamorphoo), meaning to radically change or alter by an inward process. The mind is where Christian transformation begins because it is the place where the battle for your thoughts and actions takes place. It is not about simple behavior modification but a fundamental change from the inside out.
This renewal is an ongoing process of actively engaging with Scripture, prayer, and fellowship, intentionally filling our minds with God’s truth to crowd out the lies. God transforms our minds and makes us spiritually minded by using His Word. What you sow is what you reap. The phrase “garbage in, garbage out” is true of your mind. Warren Wiersbe notes, “If the world controls your thinking, you are a conformer; if God controls your thinking, you are a transformer.” [^3]
4. Discern His Will Humbly
What will the end result be of a surrendered life in which we are constantly renewing our minds? The end result will be a mature discernment of God’s will.
The term “test and approve” suggests a gradual growth in spiritual wisdom that allows us to recognize God’s voice. Paul’s description of God’s will as “good, pleasing, and perfect” underscores its fundamentally positive nature. It is not arbitrary or restrictive; it is the most fulfilling, purposeful, and beautiful path for our lives. As your mind becomes more in tune with God’s mind through saturation of God’s word, you become more in step with His ways.
God wants your complete sanctification. He wants your body and your mind; He wants all of you. Is there anything or anyone that you are withholding from God?
The great hymn writer Isaac Watts wrote: “Were the whole realm of nature mine, that were a present far too small; Love so amazing, so divine, Demands my soul, my life, my all.” Will you offer your soul, your life, and your all to The Lord starting today as an ongoing living sacrifice of worship because of the wondrous grace that He has shown you?
Blog Footnotes
[^1]: C. H. Spurgeon, Morning and Evening (Devotional for March 22, 1869).
[^2]: Rick Ezell, “The Mercy of a Living Sacrifice: Romans 12,” Lifeway Articles (January 1, 2014).
[^3]: Warren W. Wiersbe, The Bible Exposition Commentary, vol. 1 (Wheaton, IL: Victor Books, 1996), p. 554.
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