The purpose of repentance is not to buy a ticket to heaven, and you are done and good to go.
Paul explains to the believers in
Since we have such a hope, we are very bold,
not like Moses, who would put a veil over his face so that the Israelites might not gaze at the outcome of what was being brought to an end. But their minds were hardened. For to this day, when they read the old covenant, that same veil remains unlifted, because only through Christ is it taken away. Yes, to this day whenever Moses is read a veil lies over their hearts.
But when one turns to the Lord:
- the veil is removed.
- Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom.
- And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another.
-- 2 Corinthians 3:12-18 (ESV)
Previously the priests and spiritual leaders like Moses, had to cover their faces with a veil when they approached God, but after one turned to the Lord you have the freedom to access God through Christ (John 14:6). This is because our sins which separated us from God can be forgiven because it is covered by Jesus' blood.
Repentance does not stop here. With sin out of the way we receive the Spirit of the Lord who guides believers... why? To have a happy life? No, to be "transformed into the same image" of the Lord for God's glory.
In other words, repentance is only the beginning of the process of transformation. The Father wants to adopt us as His children (Psalm 68:5). As a "child of God" you happen to be saved from eternal condemnation (Genesis 18:25). However, as a child, you are part of God's eternal family and, you need to obey your Father who raises His children from glory to glory. We need to become more like Christ who is also made in the image (John 14:9, Phil 2:5-6, Col 1:15) of his Father (1 John 5:20, Psalm 2:7).
But to turn from you sins, you must...
For godly grief produces a repentance that leads to salvation without regret, whereas worldly grief produces death. -- 2 Corinthians 7:10 (ESV)
Without conviction, you are doomed as the Prophet Isaiah wrote:
The very look on their faces gives them away. They display their sin like the people of Sodom and don’t even try to hide it. They are doomed! They have brought destruction upon themselves. -- Isaiah 3:9 (NLT)
Everyone have sin.
If we say we have no sin, we deceive ourselves, and the truth is not in us. -- 1 John 1:8 (ESV)
John, the baptist, recognized that true conviction is required to get saved in the following scripture:
But when he saw many of the Pharisees and Sadducees coming to his baptism, he said to them,
"Brood of vipers! Who warned you to flee from the wrath to come? Therefore bear fruits worthy of repentance."
-- Matthew 3:7-8 (NKJV)
Whoever conceals his transgressions will not prosper, but he who confesses and forsakes them will obtain mercy. -- Proverbs 28:13
If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. -- 1 John 1:9 (ESV)
This is exactly what David done:
I acknowledged my sin to you, and I did not cover my iniquity; I said,
“I will confess my transgressions to the Lord,”
and you forgave the iniquity of my sin.
-- Psalm 32:5
After you confessed your sins, you will still be under the bondage of sin, which means your life is still dictated by addictions, temptations, evil spirits, curses and so on. There is still a very high risk that you could fall back to your old lifestyle, which could cause you to lose your faith, which could cost you your salvation.
Therefore, you need to be set free. This is only possible with a spiritual rebirth known as Baptism (Mark 16:16, Acts 19:4, Romans 6:3-14, John 3:5, Colossians 2:12-14, Acts 22:16, Acts 2:38, 2 Corinthians 5:17).
For one who has died has been set free from sin. -- Romans 6:7 (ESV)
This means that the only way to get freed from you sin, is to die from sin (old life) and to get reborn into a new life.
Therefore, Baptism is a requirement for our transformation to become more like the Lord.