“Or do you presume on the riches of his kindness and forbearance and patience, not knowing that God's kindness is meant to lead you to repentance?” (Rom. 2:4 ESV) 

Repentance: Sincere remorse for a past sin, wrongdoing, or the like, and turning away from it and towards God.

Jesus preached repentance

“From that time Jesus began to preach, saying, “Repent, for the kingdom of heaven is at hand.” (Matt. 4:17 ESV)

God wants all to repent and none to perish

“The Lord is not slow to fulfill his promise as some count slowness, but is patient toward you, not wishing that any should perish, but that all should reach repentance.” (2 Peter 3:9 ESV) 

Therefore

“The times of ignorance God overlooked, but now he commands all people everywhere to repent, because he has fixed a day on which he will judge the world in righteousness by a man whom he has appointed; and of this he has given assurance to all by raising him from the dead.” (Acts 17:30-31 ESV)

“And Peter said to them, “Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.” (Acts 2:38 ESV)

“Bear fruit in keeping with repentance.” (Matt. 3:8 ESV)

 Quote

“We must correctly distinguish regret, remorse, and true repentance. Regret is an activity of the mind; whenever we remember what we’ve done, we ask ourselves, “Why did I do that?” Remorse includes both the heart and the mind, and we feel disgust and pain, but we don’t change our ways. But true repentance includes the mind, the heart, and the will. We change our minds about our sins and agree with what God says about them; we abhor ourselves because of what we have done; and we deliberately turn from our sin and turn to the Lord for His mercy.” - Warren Wiersbe