Philip found Nathanael, and said to him, "We have found him, of whom Moses in the law, and the prophets, wrote: Jesus of Nazareth, the son of Joseph."

 Something had happened at the baptism of Jesus which had convinced John beyond all doubt that Jesus was the Son of God. As the fathers of the church saw centuries ago, it was something which only the eye of the mind and soul could see. But John saw it and was convinced. 