“For if,” says he, “magnanimity be sufficient of itself to enable us to act in a manner superior to all other men; and if that is a part of virtue, then virtue is of itself sufficient for happiness, despising all things which seem troublesome to it.” However, Panætius and Posidonius do not admit that virtue has this sufficiency of itself, but say that there is also need of good health, and competency, and strength. And their opinion is that a man exercises virtue in everything, as Cleanthes asserts, for it cannot be lost; and the virtuous man on every occasion exercises his soul, which is in a state of perfection. LXVI. Again, they say that justice exists by nature, and not because of any definition or principle; just as law does, or right reason, as Chrysippus tells us in his treatise on the Beautiful; and they think that one ought not to abandon philosophy on account of the different opinions prevailing among philosophers, since on this principle one would wholly quit life, as Posidonius argues in his Exhortatory Essays. Another doctrine of Chrysippus is, that general learning is very useful. And the School in general maintain that there are no obligations of justice binding on us with reference to other animals, on account of their dissimilarity to us, as Chrysippus asserts in the first book of his treatise on Justice, and the same opinion is maintained by Posidonius in the first book of his treatise on Duty. They say too, that the wise man will love those young men, who by their outward appearance, show a natural aptitude for virtue; and this opinion is advanced by Zeno, in his Republic, and by Chrysippus in the first book of his work on Lives, and by Apollodorus in his Ethics. And they describe love as an endeavour to benefit a friend on account of his visible beauty; and that it is an attribute not of acquaintanceship, but of friendship. Accordingly, that Thrasonides, although he had his mistress in his power, abstained from her, because he was hated by her. Love, therefore, according to them is a part of friendship, as Chrysippus asserts in his essay on Love; and it is not blameable. Moreover, beauty is the flower of virtue.