What is the difference between Stoicism and Epicureanism?

Two rival answers to the same question

Both schools start from the same question: what is the good, the thing that makes a life go well? The Stoics answer that only virtue, excellence of character, is good, and everything else, health, wealth, even life itself, is at most a preferred indifferent. The Epicureans answer that pleasure is the good, and virtue matters only because it reliably produces pleasure and removes pain. Epictetus puts the Epicurean move bluntly: Epicurus places our good "in the husk," meaning in the body and its sensations, rather than in the mind's own judgments (Discourses I 23). For a Stoic, that is a category error. It makes your good depend on something that is not fully up to you, your flesh, your circumstances, the state of the world, rather than on your faculty of choice, which is.

The misreading to drop first

People often shrink this to a lifestyle contrast: Stoics grit their teeth, Epicureans enjoy a quiet garden. That is not the actual dispute. Epicurus was not a hedonist in the vulgar sense. He pursued pleasure through simplicity, friendship, and the absence of disturbance, not indulgence. The real dispute is about what grounds value. Seneca's letter on Epicurus shows this is not just in Stoic sources that caricature their rivals. He takes Epicurus's own letters seriously enough to argue with his wording. Epicurus had objected to those who think the wise man is self-sufficient and so needs no friendship (Moral Letters Vol I 9.1). Seneca does not dismiss Epicurus as shallow. That is a live philosophical conversation between schools that respected each other's seriousness, not a cartoon.

Where Epictetus presses hardest

Epictetus's sharpest criticism targets a tension he thinks Epicurus never resolves. Epicurus affirms that humans are naturally social, and yet he grounds the good in individual pleasure, the husk rather than the fellowship between people (Discourses I 23). Epictetus presses this into an absurdity: if pleasure of the flesh is truly the standard, why does Epicurus still advise against the political life, and even, Epictetus claims, against raising children, given the trouble and vulnerability both bring? Epictetus's answer is that Epicurus half-knows better. A parent loves a child involuntarily, prior to any calculation of pleasure, the way a sheep does not desert its young. For Epictetus this shows that natural affection, not pleasure, is a truer guide to what we are built for.

Epictetus makes a parallel charge about truth itself. Just as a skeptic who declares nothing can be known still has to use language and reasoning to say so, Epicurus denies natural fellowship among rational beings while depending on that very fellowship, through writing, arguing, and appealing to readers, to make the denial land (Discourses II 20). The criticism is not that Epicurus is dishonest. It is that his own practice argues against his theory.

What follows if the Stoic answer is right

If virtue alone is good, your happiness cannot be hijacked by pain, poverty, or loss, because none of those touch your faculty of choice. If pleasure is the good, as the Epicureans hold, then arranging your life to minimize disturbance and depend on little is the rational response, which is its own kind of discipline. The two schools agree that most people chase the wrong things for the wrong reasons. They disagree about what the right thing actually is. A useful exercise borrowed from Epictetus's method here: when you catch yourself justifying a choice by its pleasure, ask whether you would still defend it if pleasure and virtue pulled apart. That question, honestly answered, tells you which school you actually live by.