A corollary from the doctrine of the Trinity is that human knowledge is analogical. Human knowledge must always depend upon divine knowledge. Anything that a human being knows must first have been known to God. Anything a human being knows he knows only because he knows God. For that reason too man can never know anything as well and as exhaustively as God knows it.
The fact that man’s knowledge must always remain analogical is applicable to his knowledge of God as well as to his knowledge of the universe. God will never be exhaustively understood in his essence by man. If he were, he would no longer be God. In that case there would be no solution for the problem of knowledge.
A third corollary from the doctrine of the Trinity is that man’s knowledge though analogical is nevertheless true. Or to put it more specifically, man’s knowledge is true because it is analogical. It is analogical because God’s being unites within itself the ultimate unity and the ultimate plurality spoken of above. And it is true because there is such a God who unites this ultimate unity and plurality. Hence we may also say that only analogical knowledge can be true knowledge.
– Cornelius Van Til, A Survey of Christian Epistemology p. 48