'Repentance' in the Bible

So produce fruit that is consistent with repentance [demonstrating new behavior that proves a change of heart, and a conscious decision to turn away from sin];

“As for me, I baptize you with water because of [your] repentance [that is, because you are willing to change your inner self—your old way of thinking, regret your sin and live a changed life], but He (the Messiah) who is coming after me is mightier [more powerful, more noble] than I, whose sandals I am not worthy to remove [even as His slave]; He will baptize you [who truly repent] with the Holy Spirit and [you who remain unrepentant] with fire (judgment).

Go and learn what this [Scripture] means: ‘I desire compassion [for those in distress], and not [animal] sacrifice,’ for I did not come to call [to repentance] the [self-proclaimed] righteous [who see no need to change], but sinners [those who recognize their sin and actively seek forgiveness].”