Sanctification is true because it is grounded in the promises of Jesus as seen in Scripture, particularly in His prayers for His followers (John 17:19).
The truth of sanctification is anchored in the prayer of Jesus as recorded in John 17. He not only prays for the sanctification of His disciples but also expresses the reality that He Himself is set apart for their sake. This reveals that sanctification is not achieved through human effort but through divine grace bestowed upon those who believe in Christ. Jesus' resurrection and His role in the believer's life confirm that they are justified and sanctified through faith, and His sovereignty ensures that their sanctification is complete in Him. The assurance comes from knowing that this reality is upheld by God's unchanging Word.
Scripture References:
John 17:19, John 3:3-7, Romans 8:13, 2 Corinthians 3:18, 2 Corinthians 5:17, Philippians 2:13, 1 Thessalonians 5:24, Ezekiel 36, John 17:17, Ephesians 2:10, Romans 5:5, 1 Thessalonians 4:3-4, Galatians 3:1-5, Ephesians 5:25-27, Philippians 1:6, 1 Peter 1:15-16, Philippians 2:12-13, James 2:26, John 14:15
Commentary