I used the term "essence of God" to describe the divinity shared between the three Persons of the Trinity. The point is that this "divine essence" is not impersonal, but it is by virtue of this shared divinity that the Persons share attributes of the divine, and these attributes are personal. If I may spell it out, the being of God has divine attributes that are personal, and these attributes are shared between the three Persons of the Trinity. As far as I understand, there is nothing heretical about that. Perhaps this point may be a little obvious for a Westminster Seminary student (and I mean no disrespect by that), but I daresay this is not a thought that has occupied much attention in the thinking of most evangelicals.I think Collin is right. And explains why the Bible uses personal single pronouns regarding God in the Old Testament and for God - the father, God - the son, and God - the Holy Spirit in the New Testament.
Van Til and the Trinity: A Quick Response to PuritanReformed