God sanctifies His people by the definitive action of His grace, as believers are made holy through their union with Christ.
Sanctification is not a gradual process of improving one's moral fabric; instead, it is an instantaneous act of God whereby He sets apart His people in Christ. This is evident in passages like Ephesians 2:4-5, which shows how God, rich in mercy, brings those who were dead in sins to life together with Christ. The holiness that characterizes saints is a reflection of God's perfect holiness, and believers are thus made holy through Christ alone. Paul asserts in Titus 2:14 that Christ redeemed us to purify for Himself a people zealous for good works, illustrating that our sanctification is rooted in His redemptive work rather than our own efforts, affirming the core of sovereign grace theology.
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