How do we know that Jesus is able to heal and save?

The authority of Jesus is evidenced in His interactions with those who are afflicted, as illustrated in Mark 9:14-32, where He heals an epileptic boy and raises him from the brink of death. This showcases not only His power over physical ailments but also His ability to bring spiritual restoration. His miracles serve as a physical representation of His capability to save souls, as He alone possesses the divine authority to address both the physical and spiritual needs of humanity. Believers can take comfort in the fact that Jesus remains unchanging, capable of performing miracles, and saving souls today.