In terms of justification, the Bible is self-attesting because God is self-attesting, being ultimate and self-contained. Philosophically such self-attestation is not fallaciously circular, for all ultimate commitments (Enlightenment rationalism included) must be self-attesting if they are not to be self-referentially incoherent. Biblical authority and sola Scriptura mean that there is no brute factuality: all facts, including all extra-biblical facts, are interpreted in the light of God’s light in Scripture.
Daniel Strange. Their Rock Is Not Like Our Rock: A Theology of Religions (pp. 50-51). Zondervan.