The freely acting God Himself and alone is the truth of revelation

“The concept of truths of revelation in the sense of Latin propositions given and sealed once for all with divine authority in both wording and meaning is theologically impossible if it is a fact that revelation is true in the free decision of God which was taken once for all in Jesus Christ, that it is thus strictly future for us, and that it must always become true in the Church in the intractable reality of faith. The freely acting God Himself and alone is the truth of revelation … [O]nly in God and not for us is the true basis of Christian utterance identical with its true content. Hence dogmatics as such does not ask what the apostles and prophets said but what we must say on the basis of the apostles and prophets”

Barth, CD I.1, p.15