What does it mean to repent and believe the gospel?

Repentance involves a profound change of mind, which leads to a transformation of heart and behavior. In Mark 1:15, Jesus calls for repentance as he emphasizes that the kingdom of God is near. This call indicates that humanity's sinful condition necessitates a change of mind concerning sin, God, and one’s own nature. Believing the gospel, on the other hand, is trusting fully in the person and work of Jesus Christ—recognizing Him as the Son of God who bore our sins and provides righteousness. Together, repentance and belief lead to justification before God and entry into His kingdom.