The God who is there made the universe, with things together, in relationships. Indeed, the whole area of science turns upon the fact that He has made a world in which things are made to stand together, that there are relationships between things. So God made the external universe, which makes true science possible, but He also made man and made him to live in that universe. He did not make man to live somewhere else. So we have three things coming together: God, the infinite-personal God, who made the universe; and man, whom He made to live in that universe; and the Bible, which He has given us to tell us about that universe. There is intentional unity in this fashioned reality. Within this unity is ‘sure’ knowledge. Within this unity we can have certainty of existence, being, purpose and meaning.
We can know that we know what we know is true. We can ‘know’ the infinite personal God who is there.
Thoughts developed and/or taken from the works of Dr. Francis A. Schaeffer, Trilogy – He Is There and He Is Not Silent