Presuppositionalism is an epistemological school of Christian apologetics that examines the presuppositions on which worldviews are based, and invites comparison and contrast between the results of those presuppositions. It claims that apart from presuppositions, one could not make sense of any human experience, and there can be no set of neutral assumptions from which to reason with a non-Christian. Presuppositionalists claim that Christians cannot consistently declare their belief in the necessary existence of the God of the Bible and simultaneously argue on the basis of a different set of assumptions that God may not exist and Biblical revelation may not be true. Two schools of presuppositionalism exist, based on the different teachings of Cornelius Van Til and Gordon Haddon Clark. Presuppositionalism contrasts with classical apologetics and evidential apologetics. Presuppositionalists compare their presupposition against other ultimate standards such as reason, empirical experience, and subjective feeling, claiming presupposition in this context is: a belief that takes precedence over another and therefore serves as a criterion for another. An ultimate presupposition is a belief over which no other takes precedence. For a Christian, the content of Scripture must serve as his ultimate presupposition... This doctrine is merely the outworking of the 'lordship of the Christian god' in the area of human thought. It merely applies the doctrine of scriptural infallibility to the realm of knowing. Presuppositionalists contrast their approach with the other schools of Christian apologetics by describing the others as assuming that the world is unintelligible apart from belief in the existence of God and then arguing on purportedly neutral grounds to support trusting the Christian Scriptures and the existence of God. Specifically, presuppositionalists describe Thomistic (also "Traditional" or "Classical") apologetics as concentrating on the first aspect of apologetics with its logical proofs for the existence of God, simply assuming common ground with the non-Christian and utilizing a piece-by-piece methodology.