Plutarch, De communibus notitiis adversus Stoicos
Goodwin, Ed.

With what then, says he, shall I begin? And what shall I take for the principle of duty and matter of virtue, leaving Nature and that which is according to Nature? With what, O good sir, do Aristotle and Theophrastus begin? [p. 394] What beginnings do Xenocrates and Polemo take? Does not also Zeno follow these, who suppose Nature and that which is according to Nature to be the elements of happiness? But they indeed persisted in these things, as desirable, good, and profitable; and joining to them virtue, which employs them and uses every one of them according to its property, thought to complete and consummate a perfect life and one every way absolute, producing that concord which is truly suitable and consonant to Nature. For these men did not fall into confusion, like those who leap up from the ground and presently fall down again upon it, terming the same things acceptable and not desirable, proper and not good, unprofitable and yet useful, nothing to us and yet the principles of duties. But their life was such as their speech, and they exhibited actions suitable and consonant to their sayings. But they who are of the Stoic sect—not unlike to that woman in Archilochus, who deceitfully carried in one hand water, in the other fire—by some doctrines draw nature to them, and by others drive her from them. Or rather, by their deeds and actions they embrace those things which are according to Nature, as good and desirable, but in words and speeches they reject and contemn them, as indifferent and of no use to virtue for the acquiring felicity.