Everybody that got healed by Jesus and the disciples in those days had faith. No faith no healing. People must keep in mind that it is not them doing the healing, but the Holy Spirit that dwell within them . That is who you have to convince that you have faith to believe. people today look at the person and believe that they are the ones that can hill, that is why some don't get healed. Spirit dwellers are the vessel used by the Holy Spirit., and they need to let the person know that it is the Holy Spirit that heals. that is the power of God. A person without the Holy Spirit can heal no one. Just ask the seven sons of Sceva. I would bet you God laughed at that incident.