The biblical prophet Isaiah received many prophecies from the Father but it was only when Isaiah saw his Lord, who is Jesus, that Isaiah exclaimed that he was undone because of having seen the YHWH (who is the Father) - Isaiah chapter 6. Seeing Jesus we see the Father because the bond is so great between Father and Son and the Father sends the Son and the Son is so much in the likeness of the Father. It is important to realise that Isaiah, Jesus, apostles who saw Jesus and were sent by Jesus, all these testify to what we have seen. It is not merely hearsay, testifying to what others have seen, but tacit experiential knowledge, first hand. "We speak of what we know and testify to what we have seen, but still you people do not accept our testimony." Jesus said it, Isaiah said it ("Lord: Who has believed or testimony and to whom has the arm of the Lord been revealed"). I echo it too.
