Most of what we call lasting is only slow to wear out. A well-built house needs repair. A healthy body ages. Even the things preserved with great care remain vulnerable to loss.
The New Testament uses a stronger word for God, and then uses that word again for what he promises his people.
The Word
ἄφθαρτος (aphthartos) means imperishable or incorruptible. The negative beginning denies the perishability named by the rest of the word. It belongs to the same family as Phthora, corruption or decay.
Depending on the setting, English may render it immortal. The question is whether decay and destruction can have the final claim. Applied to God, the answer is no. Applied to the Christian’s future, the word describes something received from him.
Range of Meaning
The same adjective can describe God, an inheritance, the seed of new birth, or resurrected people. We should not collapse those uses into a claim that the redeemed become God. The Creator possesses life in a way his creatures do not; the creatures receive what he gives.
The repeated word nevertheless makes a connection worth hearing. The promise of a life beyond decay comes from the God who is not himself subject to it.
Where You’ll Meet It
Romans 1:23 contrasts God’s imperishable glory with images of perishable creatures. First Timothy 1:17 includes the adjective in praise of the eternal, invisible King. The NET uses immortal in both passages.
First Peter 1:4 describes an imperishable inheritance, reserved for those God guards through faith. Verse 23 speaks of new birth through imperishable seed and identifies the living, enduring Word through which this happens.
Paul applies the adjective to the resurrection itself:
“For the trumpet will sound, and the dead will be raised imperishable, and we will be changed.” (1 Corinthians 15:52, NET)
The hope concerns the dead being raised and the living being changed. It does not require us to imagine that the body is disposable and only an inward part deserves preservation.
What Confessional Lutherans Hear
God’s promise addresses the entire person. Forgiveness removes sin’s condemnation, and resurrection delivers the body from the decay that now marks it. Christ’s risen life is the ground of that hope.
The inheritance is secure because of its giver, not because Christians have discovered a naturally indestructible strength within themselves. Peter directs us to God’s power and to faith. He also directs us to the Word that endures when human glory withers.
This makes ordinary preaching more substantial than it may appear. Through words that can be spoken and heard, God gives a promise whose future is not limited by the frailty of the speaker or hearer.
So What
Care for the body and the people entrusted to you. Their present vulnerability is a reason for love, not for contempt. But do not demand that your care accomplish what only resurrection can accomplish.
The God who does not decay has promised an imperishable inheritance. What you cannot preserve against every loss is not beyond the reach of his life-giving word.