Some, again, think that we only regard the useful as a friend, their proof being that all pursue the useful, but the useless, even in themselves, they throw away (as old Socrates said, citing the case of our spittle, hairs, and nails), and that we cast off useless parts, and in the end at death our very body, the corpse being useless; but those who have a use for it keep it, as in Egypt