a. In order, in the first place, to find the definition of virtue, Chrysippus gives some good expositions of practical ethics which Diogenes Laërtius (VII. 85, 86) quotes at considerable length; they are psychological in character and in them Chrysippus establishes his formal harmony with himself. For according to him the Stoics say: “The first desire (ὁρμή) of the animal is for self-preservation, because nature from the beginning reconciled each existence with itself. This first object innate in every animal” (immanent desire) “is thus the harmony of the animal with itself, and the consciousness of the same,” the self-consciousness through which “the animal is not alienated from itself. Thus it repels what is injurious and accepts what is serviceable to it.” This is Aristotle’s conception of the nature of adaptation to an end, in which, as the principle of activity, both the opposite and its sublation are contained. “Enjoyment is not the first object, for it” (the sense of satisfaction) “is only for the first time added when the nature of an animal that seeks itself through itself, receives into itself that which is in conformity with its harmony with itself.” This is likewise worthy of approbation: self-consciousness, enjoyment, is just this return into self, the consciousness of this unity in which I enjoy something and thereby have my unity as this individual in the objective element. The case is similar in regard to man; his end is self-preservation, but with a conscious end, with consideration, according to reason. “In plants nature operates without voluntary inclination (ὁρμῆς) or sense-perception, but some things in us take place in the same manner as in plants.” For in the plant there also is the seed-containing conception, but it is not in it as end, nor as its object, for it knows nothing about it. “In animals inclination comes in; in them nature makes their impulses conformable to their first principle;” _i.e._ the end of inclination is simply the first principle of their nature, and that through which they make for their own preservation. “Rational creatures likewise make nature their end, but this is to live according to reason, for reason becomes in them the artist who produces inclination,” _i.e._ it makes a work of art in man from what in the animal is desire merely. To live in accordance with nature is thus, to the Stoics, to live rationally.