Steadfast and Unmovable
Text: I Corinthians 15:58; Colossians 1:23
Series: Restoration Sermons
Date:
Speaker: Ed Rangel
Location: Waupaca Church of Christ
Bible Version: NASB 1995
Sermon Type: Expository
Learning Objectives
By the close of this lesson the hearer should be able to:
- Explain the doctrinal basis for Paul's exhortation in I Cor. 15:58 — why "therefore" connects steadfastness to the resurrection argument.
- Distinguish "steadfast" from "unmovable" — what each word describes and how the two qualities complement each other.
- Explain why the unsteadfast person "cannot excel," using the example of Reuben in Gen. 49:4.
- Explain why "unmovable" is a virtue and not stubbornness — what distinguishes the two.
- Identify the three things a Christian must defend (Section III) and explain what "be a Gibraltar" means as a summary of the sermon's call.
Thesis
"Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord" (I Cor. 15:58). The "therefore" is the key: Paul's exhortation to steadfastness is grounded in the resurrection. Because the resurrection is real, the labor of the Lord is not in vain; because the labor is not in vain, the person doing it has every reason to be fixed in their purpose and unmoved by opposition. Steadfastness is not temperament — it is theology applied to the will.
Burden
The unstable person cannot excel. This is the sermon's burden: not a merely temperamental observation but a theological one. The person who is double-minded, easily enticed, and moved by every opposition or argument is not equipped for the Christian life's demands. The exhortation comes from the apostle who grounded it in the resurrection — which means the call to steadfastness is not stoic resolve but resurrection confidence.
Introduction
"Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord" (I Cor. 15:58). The "therefore" points back to the entire fifteenth chapter — thirty-seven verses of sustained argument for the resurrection of the dead, grounded in Christ's resurrection. Having established that the dead will be raised and that "death is swallowed up in victory" (I Cor. 15:54), Paul draws a single practical conclusion: be steadfast and unmovable.
The exhortation is also in Colossians: "if indeed you continue in the faith firmly established and steadfast, and not moved away from the hope of the gospel that you have heard" (Col. 1:23). The condition of remaining in the faith is continuing — not merely starting, but holding the position.
I. Steadfast — Fixed in Mind or Soul
Steadfast is the internal quality: fixed in conviction, settled in purpose, not tossed about by every wind of argument or circumstance.
The danger of the unsteadfast: "For this reason also, since the day we heard of it, we have not ceased to pray for you and to ask that you may be filled with the knowledge of His will in all spiritual wisdom and understanding" (the contrast is in Col. 1:23 — the person who is not firmly established is moved away from hope). The unsteadfast person's specific danger is named in II Pet. 1:5-9: the person who lacks the qualities of faith, virtue, knowledge, self-control, perseverance, godliness, brotherly kindness, and love is "blind or short-sighted, having forgotten his purification from his former sins."
The unsteadfast are easily enticed into sin. "Having eyes full of adultery that never cease from sin, enticing unstable souls" (II Pet. 2:14). The specific target of those who entice others into sin is the unstable soul — the person whose convictions are not fixed is the person who can be moved by the enticement. The fixed conviction is not primarily an intellectual achievement but a moral protection.
The unsteadfast cannot excel. Jacob's dying word to Reuben: "Unstable as water, you shall not have preeminence" (Gen. 49:4). Reuben was the firstborn — the position that should have given him preeminence. But his instability — specifically his sin of incest with his father's concubine (Gen. 35:22), which was not a one-time fall but evidence of a character that could not hold its position — disqualified him. The principle is general: the person who is unstable as water will not have preeminence; whatever excellence they briefly achieve they cannot sustain.
The steadfast have strong conviction and unwavering purpose. "But he who stands firm in his heart, being under no constraint, but has authority over his own will, and has decided this in his own heart" (I Cor. 7:37). "Therefore, beloved, since you know this beforehand, be on your guard so that you are not carried away by the error of unprincipled men and fall from your own steadfastness" (II Pet. 3:17). Steadfastness is the opposite of being carried away — it is remaining in place when forces are working to move you.
II. Unmovable — Not Moved by Another
Unmovable is the external quality: not moved by opposition, not displaced by forces that come from outside.
Unmovable is not stubbornness — it is a virtue. The distinction matters: stubbornness is the refusal to move when movement is warranted — when evidence, truth, or legitimate authority calls for it. Unmovability is the refusal to be moved when movement is not warranted — when opposition, social pressure, or threats call for capitulation on what is true and right. One is a character defect; the other is a virtue that II Pet. 1:5 calls aretē — excellence, virtue, the quality of a person who is what they are supposed to be.
Bold and strong. "Finally, be strong in the Lord and in the strength of His might" (Eph. 6:10). The strength that is called for is the strength of the Lord — not personal bravado but the strength that comes from being in the Lord and drawing on his strength. The unmovable person is not unmovable because they are naturally stubborn; they are unmovable because they are drawing on a strength that is greater than what is pressing against them.
Be a hero for the Lord; fight a good fight. "I have fought the good fight, I have finished the course, I have kept the faith" (II Tim. 4:7). Paul's summary at the end of his life: three things — fought, finished, kept. All three require the quality of unmovability: the fight is not over quickly; the course requires staying on it; the faith requires holding it when the pressure to abandon it is greatest.
The historical illustrations: Stonewall Jackson's calm in the face of the Confederate retreat at Bull Run, around whom other men rallied — his steadfastness became others' resource. The defenders of the Alamo, who held their position against overwhelming force. The general who sent the message "I hold the fort till I starve" — choosing death over surrender. The Spartan king Leonidas at Thermopylae, who held the pass with three hundred men against the Persian army. Each example illustrates the same principle: there are moments when the right thing is to hold the position at any cost, and the people who do this become the resource around which others rally.
III. What a Christian Must Defend
Steadfastness is not passive endurance — it is the active defense of specific things.
The faith. "Beloved, while I was making every effort to write you about our common salvation, I felt the necessity to write to you appealing that you contend earnestly for the faith which was once for all handed down to the saints" (Jude 3). The faith — the body of revealed truth — was handed down once and delivered once; it is not revised or updated; it is defended. The person who is steadfast defends the faith, not their version of it or their tradition's version of it but the once-delivered body of revealed truth.
A Christian character. The Christian's character is not only a private possession — it is a public witness and a resource for others. The person who maintains Christian character under pressure is defending it against the forces that would erode it. The erosion of Christian character happens gradually — through small compromises, through the steady pressure of association with those who do not share it, through the progressive substitution of the world's standards for Christ's. Steadfastness defends against the erosion.
Be a Gibraltar. The Rock of Gibraltar — a massive limestone promontory on the southern coast of Spain, at the western entrance to the Mediterranean — stands as the image of the immovable. The Christian who is a Gibraltar is not someone who never faces forces trying to move them; they are someone who faces those forces and is not moved. The rock does not move; it stands while the sea assaults it. This is the image the sermon holds up for the person who is steadfast and unmovable.
Application
The "therefore" of I Cor. 15:58 is the key to the application: the call to steadfastness is grounded in the resurrection. The person who believes in the resurrection has a reason to be steadfast that the person who does not believe cannot access. The resurrection means the labor is not in vain; the labor not being in vain means the doing of it is worth the cost of holding position against whatever opposes it.
The examination: In what area of Christian life is the pressure to be moved greatest for the specific person hearing this sermon? In doctrine? In character? In practice? The call of I Cor. 15:58 is addressed to that specific area — be steadfast there. The call of Jude 3 is addressed to the specific content being assaulted — contend earnestly for the faith that is being challenged.
Conclusion
"Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord" (I Cor. 15:58). Steadfast in conviction; unmovable by opposition; abounding in the work — not doing the minimum necessary, not holding a defensive position, but overflowing in the work of the Lord, because the resurrection means it matters and it counts.
Invitation
The resurrection that grounds the call to steadfastness is the same resurrection that grounds the gospel. "That Christ died for our sins according to the Scriptures, and that He was buried, and that He was raised on the third day according to the Scriptures" (I Cor. 15:3-4). The person who believes this good news, repents, confesses, and is baptized for the remission of sins (Acts 2:38) has entered the faith that is worth defending, in the character that is worth maintaining, in the work whose labor is not in vain.
Word Study
| English Term | Greek Term | Basic Meaning | Usage in This Sermon | Sermon Significance | Key Texts |
|---|---|---|---|---|---|
| Steadfast | hedraios | Seated, firmly placed — from hedra (a seat, foundation). Fixed in place rather than mobile. | Used in I Cor. 15:58 and 7:37 for the quality of being firmly settled in conviction and purpose. | The word describes an internal fixedness — not the external resistance to being pushed (that is ametakinētos, unmovable) but the internal settled quality of the person who has taken their position and is not going to be dislodged from it by indecision. | I Cor. 15:58; I Cor. 7:37 |
| Unmovable / Immovable | ametakinētos | Not moved — a- (negation) + metakinētos (movable, from metakineō, to move from one place to another). | Used in I Cor. 15:58 for the external quality: not moved by another. | The word describes resistance to external force. While hedraios (steadfast) describes the internal conviction, ametakinētos describes the person who cannot be pushed off their position by external opposition. The two together describe the complete quality: fixed inside, unmoved outside. | I Cor. 15:58 |
| Unstable | astēriktos | Without a support, without a fixed foundation — from stērizō, to fix, to establish. | Used in II Pet. 2:14 for the souls that deceivers target: "enticing unstable souls." | The word directly names the vulnerability: the soul that is not fixed has no anchor against the forces that work to move it. The person who is astēriktos is the specific target of those who seek to entice — because the enticement can work where there is no fixed point to resist it. | II Pet. 2:14; II Pet. 3:17 |
| Contend earnestly | epagōnizesthai | To fight hard for — the prefixed form of agōnizesthai (to contend in an athletic or military contest), intensified by epi-. | Used in Jude 3 for the Christian's obligation to the faith: to contend earnestly for it. | The word is the word of athletic and military contest — vigorous, purposeful, committed effort. The faith is not defended by passive holding; it is defended by active, earnest contending. The call is not to preserving a status quo but to fighting for what is true. | Jude 3 |
Scripture Interlock Table
| Theme | Boles' Outline | Supporting Scripture |
|---|---|---|
| "Be steadfast, immovable, abounding in the work of the Lord" | Text | I Cor. 15:58 |
| "Continue in the faith firmly established" | Text | Col. 1:23 |
| "Enticing unstable souls" — danger of unsteadfast | I.2 | II Pet. 2:14 |
| "Unstable as water — shall not have preeminence" | I.3 | Gen. 49:4 |
| "He who stands firm in his heart" | I.4 | I Cor. 7:37 |
| "Be on guard — not carried away" | I.4 | II Pet. 3:17 |
| "Be strong in the Lord and in the strength of His might" | II.2 | Eph. 6:10 |
| "I have fought the good fight; I have finished the course" | II.3 | II Tim. 4:7 |
| "Contend earnestly for the faith once delivered" | III.1 | Jude 3 |
| Baptism for remission — entering the faith worth defending | Invit. | Acts 2:38 |
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Converted from H. Leo Boles, Outline 171. Primary text: I Cor. 15:58; Col. 1:23 (stated by Boles). OCR corrections: "purpqse" → "purpose"; "stubbon" → "stubbornness"; "lll." → "III." Doctrinal audit: the "therefore" of I Cor. 15:58 preserved as the doctrinal ground of the exhortation — steadfastness is resurrection theology applied to the will; the distinction between unmovability (virtue) and stubbornness (defect) developed carefully; the Reuben illustration (Gen. 49:4) developed to show that instability disqualifies rather than merely disappoints; historical illustrations (Jackson, Alamo, Leonidas) used without idolizing military valor — each illustrates the principle of holding position at cost; Jude 3 used for active defending, not merely passive holding; invitation retains full obedient response (Acts 2:38).
