In the New Testament, it was revealed that only Jesus Christ had seen the invisible God (cf. John 1:18, 6:46). Seeing the Father means ability to do the same things as the Father: "The Son does whatever he sees the Father is doing (John 5:19)." Here the action of the Father is being imitated by the only begotten Son who sees exactly what his Father is doing and thisthe only begotten Son does what the Father does in like manner. Τhis relationship shows the Son is omnipotent and of the same nature with the Father whom he can see and imitate. The prologue of John tells us that Jesus Christ in his pre incarnate state was both God and through whom all things came into being (John 1:1, 1:3).
We do have many clear instances of Jesus Christ himself appearing as a man (theophany) in visions in the Old Testament. In these visions, Christ himself in glory appears in the form of a man. In the Old Testament, visions of the LORD God (YHWH) were visions of the Lord Jesus Christ.
In the New Testament, Jesus was God manifest in the flesh permanently. In him all the fullness of deity (θεοτης) dwells bodily (Colossians 2:9).