In order to understand the sanctification of the believers properly, one must see clearly that Christ is our sanctification in the same sense that He is our righteousness. He is a perfect and adequate Savior; He does not accomplish His work in part only, but actually and perfectly saves us; and He does not leave off His work until He has caused us to share fully in eternal life and the heavenly blessedness. By His righteousness, therefore, He not only restores us to the state of the righteous, of those who stand free in the judgment of God, in order for the rest to leave the matter in our own hands, so that, so to speak, we ourselves now proceed to earn eternal life by doing good works and conforming ourselves to the image of God; no, Christ also finishes all this work for us. He bore the guilt and penalty of sin for us, and He also kept the law for us and earned eternal life. His obedience was both passive and active, and it was both at the same time.

Bavinck, H. (2016). Our Reasonable Faith (H. Zylstra, Trans.; p. 455). Wm. B. Eerdmans Publishing Company.