follow this or that philosophy not for their own sakes only, but also for the sake of others whose good they desire as their own. These twenty-four sects again are doubled, and become forty-eight by adding a difference taken from the New Academy. For each of these four and twenty sects can hold and defend their opinion as certain, as the Stoics defended the position that the supreme good of man consisted solely in virtue; or they can be held as probable, but not certain, as the New Academics did. There are, therefore, twenty-four who hold their philosophy as certainly true, other twenty-four who hold their opinions as probable, but not certain. Again, as each person who attaches himself to any of these sects may adopt the mode of life either of the Cynics or of the other philosophers, this distinction will double the number, and so make ninety-six sects. Then, lastly, as each of these sects may be adhered to either by men who love a life of ease, as those who have through choice or necessity addicted themselves to study, or by men who love a busy life, as those who, while philosophizing, have been much occupied with state affairs and public business, or by men who choose a mixed life, in imitation of those who have apportioned their time partly to erudite leisure, partly to necessary business: by these differences the number of the sects is tripled, and becomes 288. I have thus, as briefly and lucidly as I could, given in my own words the opinions which Varro expresses in his book. But how he refutes all the rest of these sects, and chooses one, the Old Academy, instituted by Plato, and continuing to Polemo, the fourth teacher of that school of philosophy which held that their system was certain; and how on this ground he distinguishes it from the New Academy,[622] which began with Polemo's successor Arcesilaus, and held that all things are uncertain; and how he seeks to establish that the Old Academy was as free from error as from doubt,--all this, I say, were too long to enter upon in detail, and yet I must not altogether pass it by in silence. Varro then rejects, as a first step, all those differences which have multiplied the number of sects; and the ground on which he does so is that they are not differences about the supreme good. He maintains that in philosophy a sect is created only by its having an opinion of its own different from other schools on the point of the ends-in-chief. For man has no other reason for philosophizing than that he may be happy; but that which makes him happy is itself the supreme good. In other words, the supreme good is the reason of philosophizing; and therefore that cannot be called a sect of philosophy which pursues no way of its own towards the supreme good. Thus, when it is asked whether a wise man will adopt the social life, and desire and be interested in the supreme good of his friend as in his own, or will, on the contrary, do all that he does merely for his own sake, there is no question here