How do we know that Jesus has the authority to heal?

The centurion’s belief that Jesus could heal his servant merely by speaking a word highlights the recognition of Jesus’ divine authority. As stated in Matthew 28:18, 'All power is given unto me in heaven and in earth.' This declaration by Jesus assures His followers of His sovereign authority over all aspects of life, including physical health. The miracles performed by Jesus throughout the Gospels serve as testimony to His power; He not only healed the sick but also raised the dead, as demonstrated by His encounter with the widow of Nain's son. Thus, the authority of Jesus is rooted in His identity as the eternal Son of God, which provides complete assurance of His capability to save and heal.