A review of the miracles mentioned in Acts shows that something more than simple intercessory prayer is involved with the saints. In the miraculous cure of the lame man, there is no mention of intercessory prayer; there is only mention of the saint’s command: "But Peter said, ‘I have no silver and gold, but I give you what I have; in the name of Jesus Christ of Nazareth, walk.’” (Acts 3:6) In the miraculous raising of Tabitha from the dead, there is mention of both prayer and the saint’s command: "But Peter put them all outside and knelt down and prayed; then turning to the body he said, ‘Tabitha, rise.’” (Acts 9:40) In the miraculous cure of the crippled man, there is no mention of intercessory prayer; there is only mention of the saint’s command: "He listened to Paul speaking; and Paul, looking intently at him and seeing that he had faith to be made well, said in a loud voice, ‘Stand upright on your feet.’”(Acts 14:9-10) In the miraculous expulsion of the spirit of divination, there is no mention of intercessory prayer; there is only mention of the saint’s command: "But Paul was annoyed, and turned and said to the spirit, “I charge you in the name of Jesus Christ to come out of her.’” (Acts 16:18)
In the Gospels, Jesus Christ spoke about more than intercessory prayer:
21 And Jesus answered them, “Truly, I say to you, if you have faith and never doubt, you will not only do what has been done to the fig tree, but even if you say to this mountain, ‘Be taken up and cast into the sea,’ it will be done. (Matt 21:21)
And the Lord said, “If you had faith as a grain of mustard seed, you could say to this sycamine tree, ‘Be rooted up, and be planted in the sea,’ and it would obey you. (Luke 17:6)
And he called the twelve together and gave them power and authority over all demons and to cure diseases, (Luke 9:1)
In Confession, a Catholic priest doesn’t simply offer intercessory prayer. Rather, by virtue of the power he received at his ordination which traces back through apostolic succession to the Apostles upon whom Jesus Christ breathed and said, "Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained.” (John 20:22-23), the priest says, “I absolve you from your sins in the name of the Father and of the Son and of the Holy Spirit.”