Zeno, the founder, seems originally to have followed a somewhat different path. The starting-point with him was that for the attainment of the highest good, _i.e._, blessedness and spiritual peace, one must live in harmony with oneself (ὁμολογουμενους ξῃν; δ᾽ εστι καθ᾽ ἑνα λογον και συμφωνον ξῃν.—_Consonanter vivere: hoc est secundum unam rationem et concordem sibi vivere._ Stob. Ecl. eth. L. ii., c. 7, p. 132. Also: Αρετην διαθεσιν ειναι ψυχης συμφωνον ἑαυτῃ περι ὁλον τον βιον. _Virtutem esse animi affectiomem secum per totam vitam consentientem_, _ibid._, p. 104.) Now this was only possible for a man if he determined himself entirely rationally, according to concepts, not according to changing impressions and moods; since, however, only the maxims of our conduct, not the consequences nor the outward circumstances, are in our power, in order to be always consistent we must set before us as our aim only the maxims and not the consequences and circumstances, and thus again a doctrine of virtue is introduced. But the ethical principle of Zeno—to live in harmony with oneself—appeared even to his immediate successors to be too formal and empty. They therefore gave it material content by the addition—“to live in harmony with nature” (ὁμολογουμενως τῃ φυσει ζῃν), which, as Stobæus mentions in another place, was first added by Kleanthes, and extended the matter very much on account of the wide sphere of the concept and the vagueness of the expression. For Kleanthes meant the whole of nature in general, while Chrysippus meant human nature in particular (Diog. Laert., 7, 89). It followed that what alone was adapted to the latter was virtue, just as the satisfaction of animal desires was adapted to animal natures; and thus ethics had again to be forcibly united to a doctrine of virtue, and in some way or other established through physics. For the Stoics always aimed at unity of principle, as for them God and the world were not dissevered. The ethical system of Stoicism, regarded as a whole, is in fact a very valuable and estimable attempt to use the great prerogative of man, reason, for an important and salutary end; to raise him above the suffering and pain to which all life is exposed, by means of a maxim— “_Qua ratione queas traducere leniter œvum:_ _Ne te semper inops agitet vexetque cupido,_ _Ne pavor et rerum mediocriter utilium spes,_”