Maybe you haven't seen one person healing others because no one can heal another person, we can only heal ourselves. Jesus said this. He said he didn't heal anyone, their faith made them well. The power of belief?? Or the power of acceptance? Maybe it was a 2-way street...Jesus saw them as already whole and complete, and they had the faith to allow themselves to be healed. If someone doesn't want to be healed, there ain't no one gonna heal them, ever! People have an investment in being sick, for many reasons. It feel comfortable, and people don't know what they like, they like what they know.
People are afraid to feel good, to feel their emotions, to come into their full power as a God. We were created in God's image, yet we are not behaving as a God would. We have fallen so far from our original state of Godship, it will take a miracle to get back to that natural state. Becoming breatharians would be a good place to start.