Still further good faith is essential to the maintenance of the stability and constancy which we demand in friendship, for nothing that is unfaithful is stable. It is, moreover, fitting to choose for a friend one who is frank, affable, accommodating, interested in the same things with ourselves,--all which qualities come under the head of fidelity, for a changeful and wily disposition cannot be faithful, nor can he who has not like interests and a kindred nature with his friend be either faithful or stable. I ought to add that a friend should neither take pleasure in finding fault with his friend, nor give credit to the charges which others may bring against him,--all which is implied in the constancy of which I have been speaking. Thus we come back to the truth which I announced at the beginning of our conversation, that friendship can exist only between the good. It is, indeed, the part of a good or--what is the same thing--a wise man [Footnote: Wisdom and goodness were identical with the Stoics.] to adhere to these two principles in friendship,--first, that he tolerate no feigning or dissembling (for an ingenuous man will rather show even open hatred than hide his feeling by his face), and, secondly, that he not only repel charges made against his friend by others, but that he be not himself suspicious, and always thinking that his friend has done something unfriendly. To these requisites there may well be added suavity of speech and manners, which is of no little worth as giving a relish to the intercourse of friendship. Rigidness and austerity of demeanor on every occasion indeed carry weight with them, but friendship ought to be more gentle and mild, and more inclined to all that is genial and affable.