Check out my latest article, “How divine appearances and the angel of YHWH can illuminate the meaning of ‘the form of God’ and shed light on Jesus’ prayers.”

My conclusion sums it up best:

The human-like appearances of YHWH in the OT, including His appearances as the angel of YHWH, help us understand what Paul meant when he said Jesus existed “in the form of God” prior to the incarnation. He was identifying Jesus as the YHWH’s visible image in the OT, similar to Jude’s identification of Jesus as the angel of YHWH who led the Israelites in the wilderness.

These divine appearances also provide an analogue to the Father-Son communication in the NT. We see a distinction between YHWH’s invisible and visible modes of existence, and yet YHWH visible is still identified as the one and only YHWH. YHWH was active in both His invisible and visible modes simultaneously. Invisible YHWH could even communicate with visible YHWH, illustrating the possibility of communication between two modes of YHWH’s existence.

This phenomena is similar to what we see in the NT. Invisible YHWH (Father) communicated with visible YHWH (Son) and vice versa, even though the Father and Son are both YHWH. In the same way we would not say YHWH was talking to Himself in the OT, we should not think YHWH was talking to Himself in the NT. Jesus’ prayers, and the Father-Son communication generally, is due to God’s assumption of a human nature in the incarnation. When God became a man, He assumed a human nature, allowing Him to be a human being and function as a human being, including a genuine human psychology. In Jesus, YHWH is conscious of Himself as a human being. He has the mental life of a human being. In such a state, communication with the Father is not only possible, but expected.