Peter gives his second sermon in verses 12-26. Those who saw the lame man walk looked at Peter and John as though it was their own power that brought about the miracle for the lame man. Peter explains to them … why are you surprised at this and why do you keep staring at us as if we made the man walk by our own power or goodness? Peter continued to explain that the healing occurred by faith in the name of Jesus, God’s son; the God of Abraham, Isaac, Jacob and the God of their own fathers. This was the same Jesus whom they delivered up and denied in the presence of Pilate who was determined to let him go. Instead, they asked for a murderer to be granted to them in his place and so He was killed, but God raised Him from the dead as witnessed by Peter and John. It was through faith in the name of Jesus that made the lame man strong. Peter continued with a call to repent and be converted.
Acts, verses 17-23, follows the format that Peter has given them:
1. First beginning with a note of mercy and warning combined – it was through ignorance that the deed was done, but that ignorance is no longer possible and therefore there can be no excuse of further rejection. To not know is one thing, but knowing and rejecting is a sin in itself.
2. The obligation of knowledge is the obligation to repent and turn – to turn away from the old way and make a new start.
3. This repentance will have certain consequences: it will affect the past – sins will be wiped out. It will affect the future – it will bring refreshing times. Into life will come something which will be a strength in weakness and a rest in weariness.