How do we know Jesus saves sinners like the thief on the cross?

The account of the thief on the cross reveals the heart of the gospel—that Jesus saves the lost, irrespective of their past. This thief, a condemned sinner, recognized his guilt and called upon Jesus with a genuine plea. Jesus answered, 'Today shalt thou be with me in paradise', affirming the boundless mercy of God towards those who turn to Him in faith. This event serves as a vivid example of the doctrine of sovereign grace, illustrating that salvation is not based on works but on faith in Jesus Christ, who justifies the ungodly.