Put off the Old Man

Preaching the gospel includes the truth that all manking is dead in sin before God saves us and makes us a new creation and puts a new heart within us. After we are saved, we also need to crucify the former lusts, leaving the old man on the cross, and walk in the Spirit as we follow Jesus Christ. This is a daily battle, and God's Holy word is our best weapon to cleanse our mind and keep us walking on the narrow road with Jesus. 

https://www.kjvprepper.com/gospel-jesus-christ/