Self-Authentication of the Word of God

Following up on my previous post about Karl Bath and the conscience, I read an interesting chapter from William Lang Craig. In it, he explained that both Karl Barth and Rudolf Bultmann believed in the self-authentication of God's Word. Even though I already knew this, this sentence made Barth's comments on the conscience make sense to me. The conscience, enlightened by the Holy Spirit, through God's Word, is the only thing that can recognize God's Word as it really is.