Epistulae Morales ad Lucilium

Epistulae Morales ad Lucilium (Latin for "Moral Letters to Lucilius"), also known as the Moral Epistles and Letters from a Stoic, is a letter collection of 124 extant letters that Seneca the Younger wrote at the end of his life, during his retirement, after he had worked for the Emperor Nero for more than ten years. They are addressed to Lucilius Junior, the then procurator of Sicily, who is known only through Seneca's writings.

The letters often begin with an observation on daily life, and then proceed to an issue or principle abstracted from that observation. The result is like a diary, or handbook of philosophical meditations. The letters focus on many traditional themes of Stoic philosophy such as the contempt of death, the stout-heartedness of the sage, and virtue as the supreme good.

Writing

Scholars generally agree that the letters are arranged in the order in which Seneca wrote them. The 124 letters are arranged in twenty manuscript volumes, but the collection is not complete. Aulus Gellius (mid-2nd century) quotes an extract from the "twenty-second book", so some letters are missing. However since the fire of Lyon mentioned in letter 91 took place less than a year before Seneca's death (in spring 65) the number of missing letters is not thought to be very high.

Collectively the letters constitute Seneca's longest work.