How do we know God's ability to heal is true?

Throughout Scripture, God's ability to heal is consistently demonstrated through various miracles performed in both the Old and New Testaments. For instance, Jesus healed a blind man in John 9, illustrating His power over physical ailments as a manifestation of divine mercy. In addition to physical healings, these acts also serve a theological purpose, affirming Jesus as the Messiah and God incarnate. John 20:30-31 explicitly states that these signs were recorded so that we might believe Jesus is the Christ and have life through His name, verifying His authority as the great physician not only for physical needs but also for spiritual healing.