Your works are wonderful, O Lord! In the multitude of Thy virtues you measure those who despise you. - Carl Linnaeus

No one has any right to be angry with me, if I think fit to enumerate man among the quadrapeds. Man is neither a stone nor a plant, but an animal, for such is his way of living and moving; nor is he a worm, for then he would have only one foot; nor an insect, for then he would have antennae; nor a fish, for he has no fins; nor a bird, for he has no wings. Therefore, he is a quadraped, had a mouth like that of other quadrapeds, and finally four feet, on two of which he goes, and uses the other two for prehensive purposes.

Human beings, having, above all creatures, received the power of reason... need to be aware where nature is unaware. Nature reaches its culmination in humans, but human consciousness has not its essence in itself or nature.

Every genus is natural, created as such in the beginning, hence not to be rashly split up or stuck together by whim or according to anyone's theory.