How do we know Jesus is able to forgive sins?

In Matthew 9:2-6, when Jesus saw the faith of the friends who brought the paralyzed man to Him, He first said, 'Son, be of good cheer; thy sins be forgiven thee.' Then, to prove His authority to forgive sins, He healed the man, saying, 'Arise, take up thy bed, and go unto thine house.' This illustrates that only God can forgive sins, hence Jesus’ ability to both forgive and heal serves as confirmation of His divine nature. The connection between forgiveness and healing also highlights the greater issue of sin, showcasing that Jesus addresses the root cause of suffering.