How do we know that repentance is essential for salvation?

Repentance is emphasized in both the ministry of John the Baptist and Jesus, where it is presented as a necessary response to the Gospel. John preached repentance to prepare hearts for Christ's message of grace, indicating that turning from sin is foundational to faith in God. In Luke 24:47, it is said that repentance and forgiveness of sins would be preached in the name of Christ to all nations. Thus, repentance is vital because it signifies a genuine acknowledgment of one's sinfulness and need for God's grace, opening individuals to receive the salvation offered through faith in Jesus Christ.