What does it mean to be transformed into the image of Christ?

Romans 8:29 reveals that those predestined by God are conformed to the image of His Son, Jesus Christ. This transformation is a vital aspect of sanctification, whereby the Holy Spirit works within believers to cultivate Christlike qualities. It encompasses growth in virtues like love, mercy, and righteousness and aims at restoring humanity to its original purpose. As believers grow spiritually, they become more Christlike in their thoughts, actions, and attitudes, which serves as a testimony to the transformative power of the Gospel in their lives.