Repent from unbelief to belief is required for salvation. Repentance of sins is a sanctification process once "saved". It WILL happen! Some slowly, some more quickly. Jesus is the Author and Finisher of our faith.
The Bible teaches that the gospel, when accurately and properly preached, convicts the hearer of his sin and the righteousness of God, causes him to repent of his sin, and believe in the saving power of Christ, thus bringing him to salvation,
Acts 2:22. "Men of Israel, listen to these words: Jesus the Nazarene, a man attested to you by God with miracles and wonders and signs which God performed through Him in your midst, just as you yourselves know--
23. this
Man, delivered over by the predetermined plan and foreknowledge of God, you nailed to a cross by the hands of godless men and put
Him to death.
24. "But God raised Him up again, putting an end to the agony of death, since it was impossible for Him to be held in its power.
25. "For David says of Him, 'I SAW THE LORD ALWAYS IN MY PRESENCE; FOR HE IS AT MY RIGHT HAND, SO THAT I WILL NOT BE SHAKEN.
26. 'THEREFORE MY HEART WAS GLAD AND MY TONGUE EXULTED; MOREOVER MY FLESH ALSO WILL LIVE IN HOPE;
27. BECAUSE YOU WILL NOT ABANDON MY SOUL TO HADES, NOR ALLOW YOUR HOLY ONE TO UNDERGO DECAY.
28. 'YOU HAVE MADE KNOWN TO ME THE WAYS OF LIFE; YOU WILL MAKE ME FULL OF GLADNESS WITH YOUR PRESENCE.'
29. "Brethren, I may confidently say to you regarding the patriarch David that he both died and was buried, and his tomb is with us to this day.
30. "And so, because he was a prophet and knew that GOD HAD SWORN TO HIM WITH AN OATH TO SEAT
one OF HIS DESCENDANTS ON HIS THRONE,
31. he looked ahead and spoke of the resurrection of the Christ, that HE WAS NEITHER ABANDONED TO HADES, NOR DID His flesh SUFFER DECAY.
32. "This Jesus God raised up again, to which we are all witnesses.
33. "Therefore having been exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He has poured forth this which you both see and hear.
34. "For it was not David who ascended into heaven, but he himself says: 'THE LORD SAID TO MY LORD, "SIT AT MY RIGHT HAND,
35. UNTIL I MAKE YOUR ENEMIES A FOOTSTOOL FOR YOUR FEET."'
36. "Therefore let all the house of Israel know for certain that God has made Him both Lord and Christ--this Jesus whom you crucified."
The Ingathering
37. Now when they heard
this, they were pierced to the heart, and said to Peter and the rest of the apostles, "Brethren, what shall we do?"
38. Peter
said to them, "Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.
39. "For the promise is for you and your children and for all who are far off, as many as the Lord our God will call to Himself."
40. And with many other words he solemnly testified and kept on exhorting them, saying, "Be saved from this perverse generation!"
"And the very God of peace sanctify you WHOLLY; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ. FAITHFUL is he that CALLETH YOU, who also WILL DO IT ." (1 Thess 5:23-24)
The hearer of the gospel message may not necessarily be convicted of each and every imperfection in his or her life, but they will certainly be convicted of sins in their life, and those sins MUST be repented of. The Corinthians were a hard lot. They heard and received the gospel of the kingdom of God, but they were so extremely entrenched in their sins that their response to the gospel was far from complete,
1. Does any one of you, when he has a case against his neighbor, dare to go to law before the unrighteous and not before the saints?
2. Or do you not know that the saints will judge the world? If the world is judged by you, are you not competent
to constitute the smallest law courts?
3. Do you not know that we will judge angels? How much more matters of this life?
4. So if you have law courts dealing with matters of this life, do you appoint them as judges who are of no account in the church?
5. I say
this to your shame.
Is it so,
that there is not among you one wise man who will be able to decide between his brethren,
6. but brother goes to law with brother, and that before unbelievers?
7. Actually, then, it is already a defeat for you, that you have lawsuits with one another. Why not rather be wronged? Why not rather be defrauded?
8. On the contrary, you yourselves wrong and defraud.
You do this even to
your brethren.
9.
Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals,
10. nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God.
11. Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God. (NASB, 1995)
Although these “Christians” were on the road to salvation, Paul explicitly told them that unless they repented of their sin they would not inherit the kingdom of God.
1 Corinthians 1:18 For the word of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. (NASB, 1995)
Compare:
-- Revised Standard Version
1 Corinthians 1:18 For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God.
-- International English Version
1 Corinthians 1:18 To people who are being lost the message about Jesus' being nailed to a cross sounds silly, but it is God's power to us who are being saved.
-- New Jerusalem Bible
1 Corinthians 1:18 The message of the cross is folly for those who are on the way to ruin, but for those of us who are
on the road to salvation it is the power of God.
-- New American Bible
1 Corinthians 1:18 The message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
-- New Revised Standard Version
1 Corinthians 1:18 For the message about the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
--English Standard Version
1 Corinthians 1:18 For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God.
-- Young's Bible
1 Corinthians 1:18 for the word of the cross to those indeed perishing is foolishness, and to us - those being saved - it is the power of God,
-- Weymouth's New Testament
1 Corinthians 1:18 For the Message of the Cross is foolishness to those who are on the way to perdition, but it is the power of God to those whom He is saving.
-- New Living Translation
1 Corinthians 1:18 I know very well how foolish the message of the cross sounds to those who are on the road to destruction. But we who are being saved recognize this message as the very power of God.
-- International Standard Version
1 Corinthians 1:18 For the message about the cross is nonsense to those who are being destroyed, but it is God's power to us who are being saved.
-- William's NewTestament
1 Corinthians 1:18 For the message of the cross is nonsense to those who are in the process<j> of being destroyed, but it is the power of God to those who are in the process<j> of being saved.
-- Montgomery New Testament
1 Corinthians 1:18 For the message of the Cross is indeed for those on their way to destruction, foolishness; but for us who are on our way to salvation it is the power of God.
(The emphasis in bold type is mine)