The Holy Spirit has been active in the world since the creation of the world. He appears in the second verse of the Bible, for example, hovering over the face of the waters (Gen. 1:2). In every era, God is always God. The Son of God is always the visible image of the invisible Father, and the Spirit is always the one who empowers and equips. Nevertheless, we do see a difference between the Old Testament and the New in this regard. The Spirit has always been the one ministering forgiveness, and cleansing, and power. This has always been his work. But in the Old Testament, His operations were much more surgical and precise. In the New Testament era, His operations are much more torrential. Water is always water, and while it would rain in the Old Testament, in the New Testament, the dam has burst.