“There are those, of course, who deny that they need any form of authority… Such men say that they must be shown by ‘reason’ whatever they are to accept as true. But the great thinkers among non-Christian men have taken no such position. They know that they cannot cover the whole area of reality with their knowledge. They are therefore willing to admit that there may be others who have information that they themselves do not posses. In everyday life this sort of thing is illustrated in the idea of the expert” (Christian Apologetics, Cornelius Van Til, p. 161-2).