Fortunately the natural man is never fully consistent while in this life. As the Christian sins against his will, so the natural man “sins against” his own essentially Satanic principle. As the Christian has the incubus of his “old man” weighing him down and therefore keeping him from realizing the “life of Christ” within him, so the natural man has the incubus of the sense of deity weighing him down and keeping him from realizing the life of Satan within him.
The actual situation is therefore always a mixture of truth with error. Being “without God in the world” the natural man yet knows God, and, in spite of himself, to some extent recognizes God. By virtue of their creation in God’s image, by virtue of the ineradicable sense of deity within them and by virtue of God’s restraining general grace, those who hate God, yet in a restricted sense know God, and do good.
– Cornelius Van Til, An Introduction to Systematic Theology p.65