“Suppose that I am a scientist investigating the life and ways of a cow. What is this cow? I say it is an animal. But that only pushes the question back. What is an animal? To answer that question I must know what life is. But again, to know what life is I must know how it is related to the inorganic world. And so I may and must continue till I reach the borders of the universe. And even when I have reached the borders of the universe, I do not yet know what the cow is. Complete knowledge of what a cow is can be had only by an absolute intelligence, i.e., by one who has, so to speak, the blueprint of the whole universe. But it does not follow from this that the knowledge of the cow that I have is not true as far as it goes. It is true if it corresponds to the knowledge that God has of the cow.”
From Van Til, Survey of Christian Epistemology. Quoted in Bahnsen, Van Til’s Apologetic (1998), p168. Emphasis added.