What does putting off the old man mean in Christianity?

In Christian doctrine, the phrase 'putting off the old man' signifies a decisive break from our past sinful nature. As articulated in Colossians 3:9-10, believers are called to discard their old way of living and embrace their new identity in Christ, who transforms them. This involves recognizing that our former self was corrupted by sin and rebellion against God. By turning away from these old habits and mindsets, believers put on the new man, which is renewed in knowledge after the image of Christ. This transformation is not about moral reformation but a complete renewal in Christ, who becomes the center of a believer’s life. Thus, putting off the old man is an essential act of faith and obedience that all Christians are called to pursue consistently.