Further, since one is to believe and know the thing by having a syllogism of the kind called demonstration, and what constitutes it to be such is the nature of the premisses, it is necessary not merely to _know before_, but to _know better than the conclusion_, either all or at least some of, the principles, because that which is the cause of a quality inhering in something else always inheres itself more as the cause of our loving is itself more lovable. So, since the principles are the cause of our knowing and behoving we know and believe them more, because by reason of them we know also the conclusion following. Further: the man who is to have the Knowledge which comes through demonstration must not merely know and believe his principles better than he does his conclusion, but he must believe nothing more firmly than the contradictories of those principles out of which the contrary fallacy may be constructed: since he who _knows_, is to be simply and absolutely infallible. BOOK VII Chapter I. Next we must take a different point to start from,[1] and observe that of what is to be avoided in respect of moral character there are three forms; Vice, Imperfect Self-Control, and Brutishness. Of the two former it is plain what the contraries are, for we call the one Virtue, the other Self-Control; and as answering to Brutishness it will be most suitable to assign Superhuman, i.e. heroical and godlike Virtue, as, in Homer, Priam says of Hector “that he was very excellent, nor was he like the offspring of mortal man, but of a god.” and so, if, as is commonly said, men are raised to the position of gods by reason of very high excellence in Virtue, the state opposed to the Brutish will plainly be of this nature: because as brutes are not virtuous or vicious so neither are gods; but the state of these is something more precious than Virtue, of the former something different in kind from Vice. And as, on the one hand, it is a rare thing for a man to be godlike (a term the Lacedæmonians are accustomed to use when they admire a man exceedingly; σεῖος ἀνὴρ they call him), so the brutish man is rare; the character is found most among barbarians, and some cases of it are caused by disease or maiming; also such men as exceed in vice all ordinary measures we therefore designate by this opprobrious term. Well, we must in a subsequent place make some mention of this disposition, and Vice has been spoken of before: for the present we must speak of Imperfect Self-Control and its kindred faults of Softness and Luxury, on the one hand, and of Self-Control and Endurance on the other; since we are to conceive of them, not as being the same states exactly as Virtue and Vice respectively, nor again as differing in kind.