When A Dead Man Says 'Walk'

The God of Abraham, Isaac, and Jacob, the God of our fathers, glorified His Servant Jesus, whom you delivered up and denied in the presence of Pilate, when he was determined to let Him go. But you denied the Holy One and the Just, and asked for a murderer to be granted to you, and killed the Prince of life, whom God raised from the dead, of which we are witnesses. And His name, through faith in His name, has made this man strong, whom you see and know. Yes, the faith which comes through Him has given him this perfect soundness in the presence of you all. (Acts 3:13-16)

I think Peter took a certain joy in reminding the pious men of Israel about Jesus' crucifixion. Remember: some of these men know good and well they can't explain the resurrection; that's why they had to bribe the guards at Jesus' tomb. So, Peter reminded them, they denied Jesus' claims about Himself were true, and killed him to prove the point. He made a rather strong counter-argument by refusing to stay buried. 

I can see why Peter enjoyed needling them about it a little. In this one paragraph, Peter stripped these men of their authority to criticize (i.e., "hey wait, didn't you only recently let a murderer go free so you could kill a just and innocent man?") and established the power and authority of Christ to accomplish His will.

Peter wanted these men to understand that they, Peter and John, were acting under the authority of Christ, who was given authority of the Holy and Just, as the Prince of life, by the God who raised Him from the dead. 

Put another way, this man Jesus was killed, but then by the power of God was raised back from the dead. That kind of power is unmistakable. That kind of power is so great that the mere name of the One who holds it is enough, through faith, to heal the hopeless.

But what kind of faith? That's the question. If His name is enough, through faith, to heal, how strong must one's faith be? Does anyone actually have that kind of faith? Verse 16 has the answer: the faith we need comes through Him in whom we have faith. If Christ has enough power in His name to heal, He certainly has authority, too, to provide the faith we need to make it possible.