Jesus "healed all who were ill" (Mt 8:16). The people who came to him for this had faith in God (Mk 11:22). "Two blind men followed Him, crying out, 'Have mercy on us, Son of David!'" (Mt 9:27). Jesus asked, "'Do you believe that I am able to do this?'" (:28). The blind men answered, "'Yes, Lord'" (:28). Jesus responded, "'It shall be done to you according to your faith'" (:29). Then "their eyes were opened" (:30). They believed Jesus could heal them and were healed because of their faith. "'For the mouth speaks out of that which fills the heart'" (Mt 12:34). "'The word is near you, in your mouth and in your heart'-that is, the word of faith" (Ro 10:8).
A centurion asked for help saying, "'Lord, my servant is lying paralyzed at home, fearfullytormented'" (Mt 8:4). He said to Jesus, "'just say the word, and my servant will be healed'" (:8). Jesus responded, "'Go; it shall be done for you as you have believed'" (:13). Because the centurion believed that all Jesus had to do is speak the command Jesus said, "'I have not found such great faith with anyone in Israel'" (:10). "The servant was healed that very moment" (:13). The centurion had the faith and believed. A Canaanite woman asked Jesus to healher daughter. Through their talk Jesus ascertained that she believed he could heal her and said, "'O woman, your faith is great; it shall be done for you as you wish'" (Mt 15:28). "Her daughter was healed at once" (:28).
Both the centurion and Canaanite woman had "great faith." They were persistent and "strong in faith" (Ro 4:20). They believed and kept their focus. If you don't, then circumstances will undermine your confidence and your faith will be too small to get what you want (Mt 14:29-31). Peter "seeing the wind" (:30) lost focus. Thomas' focus was on seeing because he said "'Unless I see . . . I will not believe'" (Jn 20:25). When he did see, Jesus told him "'be not faithless, but believing'" (:27 KJV). Jesus said "see my hands . . . stop doubting and believe'" (:27 NIV). Not having faith and doubting are synonymous. That is why Jesus said, "'do not be unbelieving, but believing'" (:27 NASB).