8 And in Lystra a certain man without strength in his feet was sitting, a cripple from his mother’s womb, who had never walked. 9 This man heard Paul speaking. Paul, observing him intently and seeing that he had faith to be healed, 10 said with a loud voice, “Stand up straight on your feet!” And he leaped and walked.
Faith is visible. When you believe, people can see it.