A Prominent Doctrine
Jesus preached it,The Prophets preached it. So did John The Baptist, The Apostles, and The Early Evangelists. They urged people to do something that is essential to salvation.
They taught repentance and explained what it involved.
Jesus Said, Repent or Perish.
Luke 13:1-5 NKJV
There were present at that season some who told Him about the Galileans whose blood Pilate had mingled with their sacrifices.  And Jesus answered and said to them, “Do you suppose that these Galileans were worse sinners than all other Galileans, because they suffered such things?  I tell you, no; but unless you repent you will all likewise perish.  Or those eighteen on whom the tower in Siloam fell and killed them, do you think that they were worse sinners than all other men who dwelt in Jerusalem?  I tell you, no; but unless you repent you will all likewise perish.”
To repent is to turn, having a change of heart that results in a changed life.
We all must repent or perish.
Repentance follows faith and godly sorrow.
2 Corinthians 7:9-10 NKJV
Now I rejoice, not that you were made sorry, but that your sorrow led to repentance. For you were made sorry in a godly manner, that you might suffer loss from us in nothing.  For godly sorrow produces repentance leading to salvation, not to be regretted; but the sorrow of the world produces death.
It is not just being sorry but sorry enough to change and restore where possible.
God determines the acceptability of repentance. It is a matter of the heart which God, not man, can know perfectly. God knows how sincere a person is who claims to have repented. God knows if you mean it or not, or if you are just playing a game with Him. You can’t fool God who knows the thoughts and intent of your heart. Your fruit after God given repentance will also show the genuineness of your repentance from sin.
When one believes in The Lord Jesus Christ like he should, he will find no difficulty in turning from sin and then follow Jesus as Lord and Saviour of His or Her life.
Thank You Jesus. Amen.