The Holy Spirit is the coming of the man Jesus, who is the Son of God, to other men who are not this but with whom He still associates. And the witness of the Holy Spirit is the disclosure to these men, and therefore their discovery, of the fact that because they are associated with Him they can be called what they are certainly not called of themselves, and be what they can certainly never become or be of themselves children of God, children of light who in the midst of death are freed from the fear of death because as sinners they are freed from the curse of sin, and as such messengers to all those who, because they do not see the light, are still in darkness, but are not to remain in this darkness.

4:2 - Church Dogmatics (1932–1968)