How do we know that Christ is the Savior of all our sins?

In Luke 4, particularly verses 43 and 44, Jesus emphasizes that He must preach the kingdom of God, signifying His mission to save His people from their sins. His power over sickness and unclean spirits provides a preview of His ultimate saving work—defeating sin and death through His sacrifice. Scriptures such as 2 Corinthians 4:1 remind us that it is through the preaching of the gospel that we come to understand and accept Him as our Savior. By faith in Him, we receive the assurance that all our iniquities are forgiven, making Him our complete salvation.