If ever there was a doubt concerning the Son of God appearing to the Old Testament people, this one lays that to rest.
John 12:41
Isaiah said this because he saw Jesus' glory and spoke about him.

As you continue reading, start paying close attention to the frequent mentioning of the Father by Jesus. He begins to mention the Father more and more the closer He gets to the crucifixion. I (Patti) tend to wonder how Jesus felt. When I was younger (before I met Phil) I always had a very loving relationship with my parents. Whenever I was hurt or upset or scared, I always sought the comfort of my parents. Wonder if the human part of Jesus was feeling that way and He was longing for the comfort of the Father. Something to think about…