Dr. Fruchtenbaum, from his manuscript on “The Trinity,” says:
The Holy Spirit’s sometimes seen as God and sometimes He is seen as one person within the Godhead. His many appearances in the Old Testament are also evidence…
Of a number of examples, let us choose Isaiah 11:2 that reads:
The spirit of the LORD shall alight upon him: a spirit of wisdom and insight, a spirit of counsel and valor, a spirit of devotion and reverence for the LORD.
In Isaiah 11:2, the Spirit is called YHVH and then described in personal terms. A force or power does not possess insight, wisdom, reverence, etc. The Holy Spirit is an indivisible, but distinguishable person in the Godhead. A comment in the Midrash Rabbah refers to Isaiah 11:2 and appears to make this connection as well.
- Midrash Rabbah, Genesis II, 4.
… AND THE SPIRIT OF GOD HOVERED: this alludes to the spirit of Messiah, as you read, And the spirit of the Lord shall rest upon him (Isa. XI, 2).
In this midrash the Spirit of God and the spirit of the Messiah are identical. The implication would be that the Messiah is a Divine Person, equal to God yet distinguishable from God. This is proved by the fact that the Spirit is equal yet distinguishable.