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Sanctification is an on-going process in the believer's life. From the perspective of God, it has already happened - it is so certain, there can be no doubt.
From our perspective, it is ongoing: we are to continue to
"work out your salvation with fear and trembling; for it is God who is at work in you, both to will and to work for His good pleasure." (Phil 2).
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Sanctification is a word that has multiple meanings within Christianity. To answer your question we need to examine the definitions, and the teachings of the various groups.
From http://www.theopedia.com/Sanctification
Sanctification, or in its verbal form, sanctify, literally means "to set apart" for special use or purpose, that is, to make holy or sacred. Therefore, sanctification refers to the state or process of being set apart, i.e. made holy. In systematic theology, the term often carries a technical meaning that differs from the biblical word group
In this sense, a person is sanctified by God without effort on the part of the believer. God chooses whom He sets apart.It is solely the work of God.
The above definition often leads people to get confused, which leads them to mistake Justification to Sanctification. Justification is, in Protestant denominations, the instant where we are saved by Grace, and are "made right" by God. It is instant and also solely the work of God.
Sanctification is the process of being set apart for God's work and being conformed to the image of Christ. This conforming to Christ involves the work of the person. But it is still God working in the believer to produce more of a godly character and life in the person who has already been justified (Phil. 2:13). Sanctification is not instantaneous because it is not the work of God alone. The justified person is actively involved in submitting to God's will, resisting sin, seeking holiness, and working to be more godly (Gal. 5:22-23). Significantly, sanctification has no bearing on justification. That is, even if we don't live a perfect life, we are still justified.