Jesus answered, “Even if I testify on my own behalf, my testimony is valid, for I know where I came from and where I am going. But you have no idea where I come from or where I am going.
Count the I AMs. Jesus retained the knowledge of his life in heaven with the Father. The Jews did not even know of his birth in Bethlehem, let alone his pre-existence in heaven.
Some sects believe that Jesus was a created being, others that he was never divine, yet others that he 'became God', but the testimony of this Gospel is that he was 'with God in the beginning'. We have the wonderful testimony that he who has seen Jesus has seen the Father, for "I and the Father are one."