Gordon Clark and his followers treat the truth of the Scriptures as the axiom of their system. Like all axioms, this axiom is considered to be self-evident truth, not to be proven, but used for proof. Theologians and philosophers strongly influenced by Dr. Clark include Francis Schaeffer, Carl F. H. Henry, Ronald Nash, Fuller Theological Seminary President Edward J. Carnell, R. C. Sproul (though with many published reservations) and John Robbins of the Trinity Foundation. Clark's system has been described by Gary Crampton as, "The 66 books of the Old and New Testaments are self-attesting and self-authenticating. Scripture stands in judgment over all books and ideas, and it is to be judged by no person or thing. The Bible alone is the Word of God. This is the Protestant principle of sola scriptura." However, the worldview that results from the axiom may be tested for consistency and comprehensiveness. Testing for internal contradiction exemplifies Clark's strict reliance on the laws of logic (he famously translates the first verse of the Gospel of John as "In the beginning was the Logic, and the Logic was with God, and the Logic was God.") Thus, in order to invalidate non-Christian worldviews, one must simply show how a different presupposition results in necessary logical contradictions, while showing that presupposing the Bible leads to no logical contradiction. By contrast, some Van Tillians have suggested that God as He has revealed Himself in Scripture reveals apparent paradoxes.