Reading through Acts 3 and 4 - Peter and John have been with Jesus and know Him intimately. They are filled with the Holy Spirit (Acts 2) and are now walking in the fullness of the Spirit as they are headed to the temple. Their eyes are opened to things they have just passed by in the past. They are led by the Holy Spirit and tell a man, who has been lame since birth, to stand up and walk. This miracle opens the eyes of many!
Acts 4:20 "As for us, we cannot help speaking about what we have seen and heard.”