(part of which thou art), and whatsoever it is that is requisite and necessary for the preservation of the general, must of necessity for every particular nature, be good and behoveful. And as for the whole, it is preserved, as by the perpetual mutation and conversion of the simple elements one into another, so also by the mutation, and alteration of things mixed and compounded. Let these things suffice thee; let them be always unto thee, as thy general rules and precepts. As for thy thirst after books, away with it with all speed, that thou die not murmuring and complaining, but truly meek and well satisfied, and from thy heart thankful unto the gods.