Scripture uses the word in two tenses, and Hebrews 10:14 puts both in one sentence. Losing either one produces a predictable error.
Sanctification is being made holy, meaning set apart for God and increasingly shaped to look like Him. The Greek is hagiasmos. Scripture uses it in two tenses and holding only one of them causes most of the trouble.
Hebrews 10:10 says we have been made holy, past, finished, once for all. 1 Thessalonians 4:3 says it is God's will that you should be sanctified, ongoing. Both are true and neither cancels the other.
Which tense you lose determines which error you end up in, and both errors are common enough to name.
Hebrews 10:10 and 14. Made holy through the offering of the body of Jesus Christ once for all, and by one sacrifice He has made perfect forever those who are being made holy. Settled, and not by you.
2 Corinthians 3:18. We are being transformed into His image with ever-increasing glory. A process with a direction, happening over years.
Hebrews 10:14. He has made perfect forever those who are being made holy. Perfect tense and present tense in a single sentence, deliberately.
1 Corinthians 1:2 addresses them as sanctified in Christ Jesus, then spends sixteen chapters correcting them. The title is not a report on their conduct.
1 Thessalonians 5:23. May God himself sanctify you through and through. Paul asks God to do it rather than instructing them to achieve it.
2 Corinthians 7:1, Romans 12:1 and Hebrews 12:14 all give instructions. The passive is primary and the imperatives are real.
If it is happening, it is worth knowing through what. Scripture names several things and none of them are dramatic.
John 17:17. Sanctify them by the truth, your word is truth. Jesus prays it, and He names the instrument rather than leaving it open.
2 Thessalonians 2:13 and 1 Peter 1:2. Sanctifying work of the Spirit. The agent is a Person, which rules out technique.
Romans 5:3 to 5 and James 1:2 to 4. Suffering produces perseverance, character, hope. Nobody chooses this one and it is on the list anyway.
Ephesians 4:15 and 16. The body grows and builds itself up in love as each part does its work. Some of it does not happen alone at all.
Notice what is missing from that list. No formula, no threshold, no event you can schedule. Mostly it is Scripture, the Spirit, hard circumstances and a congregation, applied over a long time.
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Manage My Giving"Each of you should give what you have decided in your heart to give, not reluctantly or under compulsion, for God loves a cheerful giver."2 Corinthians 9:7
The first is treating sanctification as automatic. Positional holiness is real, so nothing else matters, and any call to actual change is legalism. Paul hits this directly in Romans 6:1 and answers by no means.
The other error is teaching that there is a second experience after conversion which delivers a permanently higher state, sometimes called entire sanctification or sinless perfection, usually attainable by full surrender.
We do not teach that. Not because we are against the Spirit's work after conversion, which we affirm strongly, but because the promised outcome is not in the text and the outcome in practice is predictable. People who believe the state is available and do not have it conclude the failure is theirs, and then either pretend or give up. Both are common and both are avoidable.
Paul writes Philippians 3:12 as a mature apostle near the end: not that I have already obtained all this, or have already arrived at my goal, but I press on. Lois Malcolm describes him as “straining forward to what lies ahead” precisely because he has already been claimed. If he had not arrived, nobody is being graded against a standard he did not meet.
And the progression in 2 Corinthians 3:18 is ever-increasing glory. Increasing has no ceiling in it. A doctrine that offers a finished state in this life has to explain why Paul, who had been caught up to the third heaven, described himself as still pressing on.
What we do teach is that real change is normal, expected, slower than anybody wants, and not the basis of your standing. Hebrews 10:14 holds both at once, and a church that keeps both tenses in view produces neither complacent people nor exhausted ones.
What does Hebrews 10:14 do that is unusual?
He has made perfect forever those who are being made holy. Already complete and still in progress, stated together, which is why holding only one tense produces an error either way.
Progress in this is genuinely hard to see from the inside, which is itself a clue about where to look.
Love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control. Fruit, which grows quietly and is noticed by other people first.
Not whether you fail but how long you stay there. Sanctification usually shows up as a faster return rather than as fewer falls.
Things that did not register start to. That is the Spirit's work and it feels like getting worse, which is why people misread it.
The people who live with you have better data than you do. Progress in this is measured relationally, and they have been watching.
One warning on that third point. An increasing awareness of your own faults is normal and healthy. A permanent sense of being unacceptable is not the same thing, and it is usually a teaching problem rather than a spiritual one.
There is a habit in Paul's letters that answers this whole question, and it is easy to miss because it sits in the greetings.
He addresses the Corinthians as those sanctified in Christ Jesus, called to be his holy people. Then he spends the letter dealing with a man sleeping with his father's wife, lawsuits between believers, drunkenness at communion and chaos in their meetings.
He does not withdraw the title. The word for holy people is the same word behind saints, and he uses it as a form of address to the worst-behaved church in the New Testament.
That is what positional sanctification means in practice. Not a description of how you are doing. A statement about whose you are, written at the top of the page, before any of the correction that follows.
For related ground, see what consecrate means, righteousness, grace, justification, the fruit of the Spirit, who the Holy Spirit is and repentance.
Hagiasmos is used in two tenses, Hebrews 10:14 puts both in one sentence, the means are Scripture and the Spirit and hard circumstances and other people rather than a formula, and Paul calls the Corinthians holy before correcting them for sixteen chapters.
Paul said he had not arrived, near the end of his life. Send it in and somebody at Sound of Heaven will work through it with you.
Being made holy, meaning set apart for God and increasingly shaped to look like Him. The Greek is hagiasmos. Scripture uses it in two tenses: Hebrews 10:10 says we have been made holy once for all, and 1 Thessalonians 4:3 says it is God's will that you should be sanctified, ongoing. Hebrews 10:14 puts both in a single sentence.
Positional is settled and not by you, established by the offering of Jesus once for all. Progressive is the transformation described in 2 Corinthians 3:18 as ever-increasing glory, happening over years. Paul addresses the Corinthians as sanctified in Christ Jesus and then spends sixteen chapters correcting them, so the title is not a report on conduct.
Scripture names truth in John 17:17, the Spirit in 2 Thessalonians 2:13, difficulty in Romans 5:3 and James 1:2, and other believers in Ephesians 4:15 and 16. No formula, no threshold and no schedulable event appears on that list. Mostly it is Scripture, the Spirit, hard circumstances and a congregation over a long time.
We do not teach it. Paul writes in Philippians 3:12, as a mature apostle near the end of his life, that he has not already obtained this or arrived at his goal. The progression in 2 Corinthians 3:18 is ever-increasing, which has no ceiling in it. People taught that the state is available and lacking it usually conclude the failure is theirs, then pretend or give up.
It is hard to see from the inside, which is itself a clue. Galatians 5:22 lists fruit, which grows quietly and is noticed by others first. The gap usually shortens before the failures stop, so a faster return is real progress. What bothers you also changes, which feels like getting worse. The people who live with you have better data than you do.