Whether it was God’s command to John the Baptist, Jesus’ command during his earthly ministry or his command in the great commission – there is no salvation, relationship with God or spiritual growth without repentance. Matthew 3:2, Matthew 4:17, Luke 24:46-47, Acts 2:37-38 all agree with this principle.
You’ll never find God’s people being promised a new anything worth having unless their willing to get rid of an old something that’s not worth keeping.
The reason so many Christians never grow up/mature/learn how feed from meat of God’s word or teach others is because their minds aren’t made up. It’s because they may be converted to the seat on Sunday morning, but they’re not converted in their heart throughout the rest of the week (Acts 3:19).
Repentance is essential because it begins in the heart, stays in the heart, changes the heart and keeps the heart yearning to please God.