Sanctification means being set apart for God, a status declared at once and a change worked out over years.
The Hebrew root qadash and the Greek hagiazo both mean, at bottom, to mark something off for God's use. A bowl, a day, a mountain, a priest, a whole nation could be qadash. This is about ownership and belonging before it is about behaviour. Something sanctified is God's, not common property anymore.
The New Testament stretches hagiazo across two different moments that the single English word has to carry together. Paul tells believers they already were sanctified, past tense, a fact settled at conversion. He also tells them to pursue sanctification, present tense, an ongoing shaping of character. One Greek word, two timeframes, one flat English noun trying to hold both.
“Tell the Israelites, ‘Surely you must keep My Sabbaths, for this will be a sign between Me and you for the generations to come, so that you may know that I am the LORD who sanctifies you.
God calls himself the one who sanctifies Israel, tying holiness to relationship, not first to conduct.
Sanctify them by the truth; Your word is truth.
Jesus prays that truth itself would sanctify his followers, linking the word to being shaped by God's word.
Now may the God of peace Himself sanctify you completely, and may your entire spirit, soul, and body be kept blameless at the coming of our Lord Jesus Christ.
Paul asks God to sanctify believers 'wholly,' treating it as a process still underway.
because by a single offering He has made perfect for all time those who are being sanctified.
One sacrifice has perfected 'those who are being sanctified,' holding the finished and ongoing senses in one sentence.
Translators spread the same Greek family (hagios, hagiazo, hagiasmos) across several English words: sanctify, holy, consecrate, saint. That choice hides a plain fact in the Greek: a 'saint' is literally 'a sanctified one.' Hebrew qadash gets the same scattering, rendered as consecrate, dedicate, or hallow depending on context, which obscures how often the same root recurs.
People often hear sanctification as nothing but slow moral effort, becoming a nicer person by degrees. But the New Testament also uses the word for something already finished at conversion, a status of belonging to God rather than a project still in progress. Both senses are genuinely there. Missing the finished one turns the Christian life into pure self-improvement.
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