“Our argument as over against this would be that the existence of the God of Christians theism and the conception of his counsel as controlling all things in the universe is the only presupposition which can account for the uniformity of nature the scientist needs. But the best and only possible proof for the existence of such a God is that his existence is required for the uniformity of nature and for the coherence of all things in the world. We cannot prove the existence of beams underneath a floor if by proof we mean that they must be ascertainable in the way that we can see the chairs and tables of the room. But the very idea of a floor as the support of tables and chairs requires the idea of beams that are underneath. But there would be no floor if beams were not underneath. Thus there is absolutely certain proof for the existence of God and the truth of Christian theism. Even non-Christians presuppose its truth while they verbally reject it. They need to presuppose the truth of Christian theism in order to account for their own accomplishments” (Cornelius Van Til, The Defense of the Faith, 125-126).
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I love this analogy from Van Til on Presuppositional apologetics! Over the years I’ve tried to form more Presuppositional apologetics illustrations on my blog, some of which one can find here: http://veritasdomain.wordpress.com/2013/12/04/twenty-apologetics-illustrations-by-slimjim/