How do we know that sanctification through Christ is true?

The doctrine of sanctification through Christ is founded upon theological truths found in Scripture. In Ephesians 4:22-24, Paul instructs believers to 'put off your old self' and 'put on the new self, created to be like God in true righteousness and holiness.' This imagery illustrates that believers undergo a transformative process initiated by the Holy Spirit, wherein they are equipped to live a life that reflects Christ. Additionally, the internal changes experienced by those who genuinely embrace faith in Christ serve as evidence of His sanctifying work—leading to a life increasingly marked by holiness, love, and obedience. The assurance comes not only from Scripture's promises but also from the faithful experience of Christians who witness this change in their lives.