Plutarch De Iside et Osiride 4

[4] It is true that most people are unaware of this very ordinary and minor matter: the reason why the priests remove their hair and wear linen garments. ¹ Some persons do not care at all to have any knowledge about such things, while others say that the priests, because they revere the sheep, ² abstain from using its wool, as well as its flesh; and that they shave their heads as a sign of mourning, and that they wear their linen garments because of the colour which the flax displays when in bloom, and which is like to the heavenly azure which enfolds the universe. But for all this there is only one true reason, which is to be found in the words of Plato ³ ; for the Impure to touch the Pure is contrary to divine ordinance. No surplus left over from food and no excrementitious matter is pure and clean; and it is from forms of surplus that wool, fur, hair, and nails originate and grow. ⁴ So it would be ridiculous that these persons in their holy living should remove their own hair by shaving and making their bodies smooth all over, ⁵ and then should put on and wear the hair of domestic animals. We should believe that when Hesiod ⁶ said, he was teaching that men should be clean of such things when they keep high festival, and they should not amid the actual ceremonies engage in clearing away and removing any sort of surplus matter. But the flax springs from the earth which is immortal; it yields edible seeds, and supplies a plain and cleanly clothing, which does not oppress by the weight required for warmth. It is suitable for every season and, as they say, is least apt to breed lice; but this topic is treated elsewhere. ⁷

[4] For the greater part of men are ignorant even of this most common and ordinary thing, for what reason priests lay aside their hair and go in linen garments. Some are not at all solicitous to be informed about such questions; and others say their veneration for sheep is the cause why they abstain from their wool as well as their flesh, and that they shave their heads in token of mourning, and that they wear linen because of the bloomy color which the flax sendeth forth, in imitation of that ethereal clarity that environs the world. But indeed the true reason of them all is one and the same. For it is not lawful (as Plato saith) for a clean thing to be touched by an unclean; but now no superfluity of food or excrementitious substance can be pure or clean; but wool, down, hair, and nails come up and grow from superfluous excrements. It would be therefore an absurdity for them to lay aside their own hair in purgations, by shaving themselves and by making their bodies all over smooth, and yet in the mean time to wear and carry about them the hairs of brutes. For we ought to think that the poet Hesiod, when he saith, would teach us to keep the feast when we are already cleansed from such things as these, and not in the solemnities themselves to use purgation or removal of excrementitious superfluities. But now flax springs up from an immortal being, the earth, and bears an eatable fruit, and affords a simple and cleanly clothing, not burdensome to him that is covered with it, and convenient for every season of the year, and which besides (as they tell us) is the least subject to engender vermin; but of this to discourse in this place would not be pertinent.