Non-christian thinkers have for centuries usurped the term philosophy. They claimed to be the only ones that followed the facts and operated by principles of reason. They pretended and still pretend to do that which every honest man who opens his eyes and uses his intellect ought to do. As a matter of fact on any but the Christian, and more specifically the Calvinist view, facts are meaningless and reason operates in a vacuum. On any but the Christian basis man, using this reason, is a product of Chance and the facts which he supposedly orders by the “law of contradiction” are also products of Chance. Why should a “law of contradiction” resting on Chance be better than a revolving door moving nothing out of nowhere into no place? Only on the presupposition that the self-contained God of Scripture controls all things, can man know himself or anything else. But on this presupposition the whole of his experience makes good sense. Thus a truly Christian philosophy is the only possible philosophy. Other philosophies are or should be called such by courtesy. Those who crucify reason while worshipping it; those who kill the facts as they gather them, ought not really to be called philosophers.
Insisting upon “reason” as the test of truth they have completely divorced the operation of “reason” from the turmoil of fact. They cannot find coherence in anything on their principle. Fear, nothing but fear in the dark, remains.
– Cornelius Van Til, Christian Philosophy