What is sanctification?… Regeneration is the new birth, sanctification is the growth that necessarily results from it. Justification is God’s declaration that a believing sinner is righteous because of the merits of Christ imputed to him. Sanctification is the believer leaving the courtroom where God has once and for all time declared him righteous, and immediately beginning the process whereby God’s Spirit enables him to increasingly conform to Christ’s righteousness, both inwardly and outwardly… We may say that sanctification has nothing to do with regeneration or justification, and yet it has everything to do with demonstrating that one has experienced them.