Epicurus wrote a great deal and almost none of it survives. What remains is three letters, a set of maxims called the Principal Doctrines, some fragments, and the accounts of later writers, several of them hostile. The word epicurean now means something close to the opposite of what he taught: he argued for a modest life of friendship, simple food, and freedom from anxiety, not for luxury.
That distortion is a reading-order problem. If you start with the modern popular treatments, you get the misunderstanding corrected but not the texts. If you start with the fragments, you get texts without context. The workable sequence is to meet the surviving words, then the great poem that transmits the system, then the story of how it was nearly lost, then the scholarship that assesses it.
The surviving words
The art of happiness, Henry Dwight Sedgwick's presentation of Epicurus, is a gentle way in: it puts the philosophy in front of a general reader without demanding prior study of ancient thought. Take it as an orientation rather than a scholarly source.
Then go to the primary material. The lives and opinions of eminent philosophers by Diogenes Laertius matters here for one reason: Book X preserves the Letter to Menoeceus, the Letter to Herodotus, the Letter to Pythocles, and the Principal Doctrines. Without it we would have almost nothing. Read the Menoeceus letter first; it contains the ethical core, including the argument that death is nothing to us because where death is, we are not.
The poem that carries the system
On the Nature of Things by Lucretius is the fullest surviving statement of Epicurean physics and psychology, written as Latin verse a couple of centuries after Epicurus. It argues that everything is atoms and void, that the soul is material and dissolves at death, that the gods exist but take no interest in us, and that fearing divine punishment or the afterlife is the principal source of human misery. The swerve of atoms, introduced to make room for free will, is the detail people remember.
Read it slowly and in a translation you enjoy. It is philosophy and it is genuinely great poetry, and the two are not separable in it.
How it survived, and what it means
The swerve by Stephen Greenblatt tells the story of Poggio Bracciolini recovering a manuscript of Lucretius in 1417 and argues for its role in the making of modernity. It is a compelling narrative and it won major prizes; it has also been criticised by medievalists for overstating the darkness of the preceding centuries and the singularity of the rediscovery. Read it for the story and hold the thesis loosely.
The Therapy of Desire by Martha Nussbaum is the serious philosophical treatment, examining Epicureans, Sceptics, and Stoics as schools that understood philosophy as medicine for the soul. Her chapters on Epicurean arguments about desire, fear, and death are the most rigorous accessible account available, and they take the therapeutic claim seriously enough to test it.
Epicureanism by Tim O'Keefe is the clean scholarly introduction to the whole system, physics through ethics, and is the book to read when you want the doctrines laid out precisely rather than narrated.
Close with How to Live a Good Life, the comparative collection edited by Massimo Pigliucci, Skye Cleary, and Daniel Kaufman, in which advocates of many traditions each make a case for their own. It puts Epicureanism back into competition, which is a good final test of whether you found it persuasive. More thinker paths sit under understanding Seneca.
Follow the full ordered path here: Best Books to Understand Epicurus, in Reading Order.
