 In historical Christian thought, the concepts of (special) revelation and faith go together. Faith is the believing response to the divine revelation (Dulles 1992: 4). There has been a broad consensus that the act of faith requires grace in the sense of an internal, divine influence or assistance. However, classical Christian thinkers also agree that the act of faith is reasonable, and that Christian belief is epistemically justified to an eminent degree (Lamont 2004: 46). In modern parlance, “faith” is often understood as synonymous with “unsupported belief”, but this understanding is alien to the historical tradition, for which faith constitutes a form of knowledge. It is traditionally agreed, moreover, that faith has this rational status because it is based on the authority of God’s own testimony. In much pre-modern theology it is unclear, however, exactly how God’s testimony or speech is identified as such, and what warrants this identification. 