So that while we speak of the fallen man as the natural man, as against the supernatural man, who is a redeemed man in a very real sense we should say that sin is unnatural. With man, who was created into perfect knowledge, and his destiny is hell or salvation. Moreover man was created to exercise dominion and to rule the earth. This is man's calling and it is basic to man's nature.
Audio lectures - Creationism and Psychology (n. d.)