Apologists who follow Van Til earned the label "presuppositional" because of their central tenet that the Christian must at all times presuppose the supernatural revelation of the Bible as the ultimate arbiter of truth and error in order to know anything. Christians, they say, can assume nothing less because all human thought presupposes the existence of the God of the Bible. They claim that by accepting the assumptions of non-Christians, which fundamentally deny the Trinitarian God of the Bible, one could not even formulate an intelligible argument. Though Van Tillians do, at one point, "put themselves in the shoes" of the opponent, "for the sake of argument", to demonstrate where that position would lead, they claim that they can only do so because this is actually God's world, and man is actually God's creature, made in God's own image, and as such can never completely shut God out (in living or thinking)—hence there is always a common basis for dialogue, even though it is, in the presuppositionalist's view, a basis which the opponent is not usually willing to acknowledge and which is decidedly biased rather than neutral.