[172] And this command is placed, as it were, on the borders between the two tables of laws relating to God and those relating to man, and so it bounds the five which concern piety, and that five also which comprehend a prevention of injury to one’s fellows. Since mortal parents are the boundaries of the immortal powers, which, generating everything according to nature, have permitted this lowest and mortal race to imitate their own powers of generation, and so to propagate its own seed; for God is the beginning of all generation, and the mortal species of mankind, being the lowest and least honoured of all, is the end.