Man is more than merely an animal to exist and propagate his species. His mind gives him capacity to search out the great truths in God's arrangement and this lifts him far above the other animal creation.
Every one is a genius, more or less. No one is so physically sound that no part of him will be even a little unsound, and no one is so diseased but that some part of him will be healthy -- so no man is so mentally and morally sound, but that he will be in part both mad and wicked; and no man is so mad and wicked but he will be sensible and honourable in part. In like manner there is no genius who is not also a fool, and no fool who is not also a genius.