To open their eyes, in order to turn them from darkness to light, and from the power of Satan to God, that they may receive forgiveness of sins and an inheritance among those who are sanctified by faith in Me. Acts 26:18 NKJV
Here, faith is the instrument by which we are said to be sanctified, because it connects us with Christ. The very moment the sinner believes on the Lord Jesus Christ he becomes linked with Him. He is made one with Him, complete in Him, accepted in Him. This is true sanctification and justification. It is not a process. It is not a gradual work. It is not progressive. The word is very explicit. It says, “those who are sanctified by faith in Me.” It does not say, “which shall be sanctified, or “which are being sanctified.” If such were the doctrine, it would have been so stated.
No doubt, the believer grows in the knowledge of this sanctification, in his sense of its power and value, its practical influence and results, the experience and enjoyment of it. As “the truth” pours its divine light upon his soul, he enters into a more profound apprehension of what is involved in being “set apart” for Christ, in the midst of this evil world. All this is blessedly true; but the more its truth is seen, the more clearly we shall understand that sanctification is not merely a progressive work, wrought in us by the Holy Spirit, but that it is one result of our being linked to Christ, by faith, whereby we become partakers of all that He is. This is an immediate, a complete, and an eternal work.
“Whatever God does, it shall be forever. Nothing can be added to it, and nothing taken from it” (Eccl. 3:14). The stamp of eternity is fixed upon every work of God’s hand: “Nothing can be added to it,” and, blessed be His name, “nothing taken from it.”