Ok so tell me, what is the person repenting from?
How does he know he did something wrong? He has to learn from another sinful human as you said?
How does he know what IS WRONG?
How does he know what IS SIN?
Changing your mind from what? You need to know what you are doing wrong, you need to know what Sin is, inorder to change your mind. - Its not that difficult.
There is two types of repentance used in the bible.
Metanoia a transformative change of heart; especially: a spiritual conversion."
[1] The term suggests repudiation, change of mind, repentance, and atonement; but "conversion" and "reformation" may best approximate its connotation.
[2] In The
King James Version of the Bible, its verbal cognate
metanoeo/μετανοέω is translated as
repent.
[3] As shown in Psalms 51
metamelomai.” This word is used to show a change of mind, such as to produce regret or even remorse on account of sin, but not necessarily a change of heart. This word is used to describe the repentance of Judas (Matthew 27:3).
What someone is repenting of....is sin.
What is sin?
1 John 3:4King James Version (KJV)
4 Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.
He is repenting for salvation, from the wrath of God.
Romans 5:9King James Version (KJV)
9 Much more then, being now justified by his blood, we shall be saved from wrath through him.
1 Thessalonians 5:9King James Version (KJV)
9 For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ,
How does He know he did something wrong? You tell Him, using the law.
For the law is perfect in convicting the soul, it is the schoolmaster which brings people to Christ
Psalm 19:7King James Version (KJV)
7 The law of the Lord is perfect, converting the soul: the testimony of the Lord is sure, making wise the simple.
Galatians 3:24King James Version (KJV)
24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.
We should do it just the way Jesus did it, with the woman at the well in John 4:7-26
1. Jesus began n the natural realm (v.7)
2. Jesus swung the conversation to the spiritual realm (v.10)
3. Jesus brought conviction using the Law of God (vv. 16-18)
4. Jesus revealed Himself to her (v. 26)
There is a right way to spread the Gospel.