In epistemology (the investigation of what distinguishes justified belief from opinion) we know that ‘things’ are there because God made them to be there. The things we see are not an extension of his essence, they are not a dream of God, as much Eastern thinking says things are. They are really there. They have a true objective reality, and we are not surprised to find that there is a correlation between the observer and the observed because God made them to go together. They are made by the same God in the same frame of reference. God made them together, the subject and the object, and the knower and the known, and He made them in the same frame of reference. The Christian does not have a problem with epistemology. And every man lives as though it is true, regardless of what he says in his theories. The Christian is not surprised that the tree is there, and he is not surprised that he cannot walk through it, because he knows the tree is really there.
Now everybody has to face this truth, whether it is a very intellectual man who might fight the Christian view, or whether it is the very simple one who lives as though the Christian view is true simply because he acts that way without asking any questions. To both of these the Christian says, what do you expect? Naturally this is the way it is, because the reasonable God made both the subject and the object. He makes the subject and He makes the object, and He gives us the Bible to give us knowledge we need about the universe and life and existence.
Thoughts developed and/or taken from the works of Dr. Francis A. Schaeffer, Trilogy – He Is There and He Is Not Silent