Who Is the Holy Spirit?

Expounding the doctrine of the Spirit from 1 Cor. 2, John Owen asks, "Who is this Spirit?" He answers, of course, with scriptural clarity (unlike so many fuzzy, cloudy claims to truth today):

The apostle [Paul] tells us that the "judgments of God are unsearchable, and his ways past finding out' (Rom. 11:33); and he asketh, "Who hath known the mind of the Lord? or who hath been his counsellor?" (Rom. 11:34). And yet this Spirit is said to "search all things, yea, the deep things of God" (1 Cor. 2:10), such as to all creatures are absolutely unsearchable and past finding out. This, then, is the Spirit of God himself, who is God also; for so it is in the prophet from whence these words are taken: "Who hath directed the Spirit of the LORD, or being his counsellor hath taught him?" (Isa. 40:13).

—John Owen, "Pneumatologia," Works, vol. 3, p.79.