Seneca, who is known as a thorough-going and uncompromising Stoic, when in his treatise _De Vita Beata_ (c. 12, 13) he happens to speak of the Epicureans, gives testimony which is above suspicion to the ethical system of Epicurus: “My verdict is, however—and in thus speaking I go, to some extent, against many of my own countrymen—that the moral precepts of Epicurus prescribe a way of life that is holy and just, and, when closely considered, even sorrowful. For every pleasure of Epicurus turns on something very paltry and poor, and we scarcely know how restricted it is, and how insipid. The self-same law which we lay down for virtue he prescribes for pleasure; he requires that Nature be obeyed; but very little in the way of luxury is required to satisfy Nature. What have we then here? He who calls a lazy, self-indulgent, and dissolute life happiness merely seeks a good authority for a thing that is evil, and while, drawn on by a dazzling name, he turns in the direction where he hears the praise of pleasure sounding, he does not follow the pleasures to which he is invited by Epicurus, but those which he himself brings with him. Men who thus abandon themselves to crime seek only to hide their wickedness under the mantle of philosophy, and to furnish for their excesses a pretext and an excuse. Thus it is by no means permitted that youth should hold up its head again for the reason that to the laxity of its morality an honourable title has been affixed.” By the employment of our reflective powers, which keep guard over pleasure and consider whether there can be any enjoyment in that which is fraught with dangers, fear, anxiety and other troubles, the possibility of our obtaining pleasure pure and unalloyed is reduced to a minimum. The principle of Epicurus is to live in freedom and ease, and with the mind at rest, and to this end it is needful to renounce much of that which men allow to sway them, and in which they find their pleasure. The life of a Stoic is therefore but little different from that of an Epicurean who keeps well before his eyes what Epicurus enjoins.
It might perhaps occur to us that the Cyrenaics had the same moral principle as the Epicureans, but Diogenes Laërtius (X. 139, 136, 137) shows us the difference that there was between them. The Cyrenaics rather made pleasure as a particular thing their end, while Epicurus, on the contrary, regarded it as a means, since he asserted painlessness to be pleasure, and allowed of no intermediate state. “Neither do the Cyrenaics recognize pleasure in rest (καταστηματικήν), but only in the determination of motion,” or as something affirmative, that consists in the enjoyment of the pleasant; “Epicurus, on the contrary, admits both—the pleasure of the body as well as that of the soul.” He meant by this that pleasure in rest is negative, as the absence of the unpleasant, and also an inward contentment, whereby rest is maintained within the mind. Epicurus explained these two kinds of pleasure more clearly as follows: “Freedom from fear and desire (ἀταραξία) and from pain and trouble (ἀπονία) are the passive pleasures (καταστηματικὶα ἡδοναί),”—the setting of our affections on nothing which we may run the risk of losing; pleasures of the senses, on the other hand, like “joy and mirth (χαρὰ δὲ καὶ εὐφροσύνη), are pleasures involving movement (κατὰ κίνησιν ἐνεργείᾳ βλέπονται.9)” The former pleasures Epicurus held to be the truest and highest. “Besides this, pain of the body was held by the Cyrenaics to be worse than sorrow of the soul, while with the Epicureans this is reversed.”