You've got to wonder if what Jesus told the leper was all in jest because the leper couldn't keep his mouth shut. He couldn't help but go and tell everyone what Jesus had done for him. It's as if Jesus infected the leper with something way more contagious than leprosy. Jesus had infected him with hope that leads to love.
Maybe it’s the prayer of healing for our enemies that ends up being the best thing that could happen to us.