So then the Irrational is plainly twofold: the one part, the merely vegetative, has no share of Reason, but that of desire, or appetition generally, does partake of it in a sense, in so far as it is obedient to it and capable of submitting to its rule. (So too in common phrase we say we have λόγος of our father or friends, and this in a different sense from that in which we say we have λόγος of mathematics.)[44] Now that the Irrational is in some way persuaded by the Reason, admonition, and every act of rebuke and exhortation indicate. If then we are to say that this also has Reason, then the Rational, as well as the Irrational, will be twofold, the one supremely and in itself, the other paying it a kind of filial regard. The Excellence of Man then is divided in accordance with this difference: we make two classes, calling the one Intellectual, and the other Moral; pure science, intelligence, and practical wisdom—Intellectual: liberality, and perfected self-mastery—Moral: in speaking of a man’s Moral character, we do not say he is a scientific or intelligent but a meek man, or one of perfected self-mastery: and we praise the man of science in right of his mental state;[45] and of these such as are praiseworthy we call Excellences. BOOK II Chapter I. Well: human Excellence is of two kinds, Intellectual and Moral:[1] now the Intellectual springs originally, and is increased subsequently, from teaching (for the most part that is[2]), and needs therefore experience and time; whereas the Moral comes from custom, and so the Greek term denoting it is but a slight deflection from the term denoting custom in that language. From this fact it is plain that not one of the Moral Virtues comes to be in us merely by nature: because of such things as exist by nature, none can be changed by custom: a stone, for instance, by nature gravitating downwards, could never by custom be brought to ascend, not even if one were to try and accustom it by throwing it up ten thousand times; nor could file again be brought to descend, nor in fact could anything whose nature is in one way be brought by custom to be in another. The Virtues then come to be in us neither by nature, nor in despite of nature,[3] but we are furnished by nature with a capacity for receiving themu and are perfected in them through custom.