But when these foundations had been laid by nature, certain great increases of good were produced,—some arising from the contemplation of more secret things, because there is a love of knowledge innate in the mind, in which also the fondness for explaining principles and for discussing them originates; and because man is the only animal which has any share of shame or modesty; and because he also covets union and society with other men, and takes pains in everything which he does or says, that he may do nothing which is not honourable and becoming;—these foundations being, as I have said, implanted in us by nature like so many seeds, temperance, and modesty, and justice, and all virtue, was brought to complete perfection. VIII. You here, O Cato, have a sketch of the philosophers of whom I am speaking; and, now that I have given you this, I wish to know what reason there is why Zeno departed from their established system; and which of all their doctrines it was that he disapproved of? Did he object to their calling all nature a preserver of itself?—or to their saying that every animal was naturally fond of itself, so as to wish to be safe and uninjured in its kind?—or, as the end of all arts is to arrive at what nature especially requires, did he think that the same principle ought to be laid down with respect to the art of the entire life?—or, since we consist of mind and body, did he think that these and their excellences ought to be chosen for their own sakes?—or was he displeased with the preeminence which is attributed by the Peripatetics to the virtue of the mind?—or did he object to what they said about prudence, and the knowledge of things, and the union of the human race, and temperance, and modesty, and magnanimity, and honourableness in general? The Stoics must confess that all these things were excellently explained by the others, and that they gave no reason to Zeno for deserting their school. They must allege some other excuse.