Incredibly, the crippled man stood to his feet and began to leap, praising God for his healing. Those who witnessed this miracle were astonished, and were undoubtedly in awe of the Apostles. But Peter immediately shot down any misdirected impressions of credit. This is another one of the mysteries. But in reality, it could be the faith of the sick person, the congregation, or the combination of them all.
Supernatural gifts are irrevocable.
Many theologians believe that spiritual gifts are initially given only to Godly, Spirit-filled people. But later, if they become corrupt, or even deny the faith, God will not withdraw the gift. If this interpretation is correct, this would be further explanation why signs and wonders might accompany false prophets, and further evidence why we should never use miracles, alone, as a way to identify true men of God. Others hold the opinion that spiritual gifts are never actually given to individuals as their possession. In this case, God might use whatever vessel is available, despite its impurity, because of His love and desire to bless the body.