And we must consider that some of the passions are natural, and some empty; and of the natural ones some are necessary, and some merely natural. And of the necessary ones some are necessary to happiness, and others, with regard to the exemption of the body, from trouble; and others with respect to living itself; for a correct theory, with regard to these things, can refer all choice and avoidance to the health of the body and the freedom from disquietude of the soul. Since this is the end of living happily; for it is for the sake of this that we do everything, wishing to avoid grief and fear; and when once this is the case, with respect to us, then the storm of the soul is, as I may say, put an end to... When, therefore, we say that pleasure is a chief good, we are not speaking of the pleasures of the debauched man, or those which lie in sensual enjoyment, as some think who are ignorant, and who do not entertain our opinions, or else interpret them perversely; but we mean the freedom of the body from pain, and of the soul from confusion. — Diogenes Laertius, *Lives of Eminent Philosophers*, Book X, Section XXVII (Epicurus, *Letter to Menoeceus*), trans. C. D. Yonge (1853). **Surface Gloss:** Writing to Menoeceus, Epicurus classifies desires into natural-necessary, merely natural, and empty, defining supreme pleasure not as sensual indulgence, but as the zero-state where bodily pain and mental turmoil are completely removed. **The Katastematic Ceiling & Desire Audit:** Run every goal, purchase, or ambition through Epicurus's three-bucket filter: 1. Does failing to get this cause actual physical or existential pain? (*Natural + Necessary* — secure immediately at lowest cost). 2. Does it merely vary the flavor of an already pain-free state without raising the ceiling? (*Natural + Non-Necessary* — enjoy when free, drop instantly when expensive). 3. Is its intensity driven entirely by status-narrative and "vain opinion"? (*Empty* — kill on sight). Remember the ceiling law: once friction and want are at zero, you are already at maximum altitude; expensive additions only change the wallpaper.
— In our words · Source: Lives of Eminent Philosophers (Diogenes Laertius)