The paper discusses the conception of philosophy and ethics in Seneca’s Letters, as well as in his other writings, which it sets in the broader context of ancient and modern thought. The introduction outlines the Socratic and Stoic foundations of Seneca’s ethics. The next section focuses on the interpretation of passages from the Letters that remind us that the task of philosophy is to teach human to live an active life. The paper points out that, according to Seneca, philosophy resembles (...) art more than knowledge, and Seneca adapts his language and the examples he uses to this effect. In the next section, the paper returns to delineating the relationship between theoretical and practical thought. The specificity of Seneca’s position becomes visible in the background of Aristotle’s problematization of this relationship. The last section asks how we should approach Seneca’s conception of ethics and philosophy. The analyses outlined above show that Seneca’s Letters fully express an approach to philosophy as an art of living, an approach that modern authors such as Nietzsche and Foucault consider determinative for the whole of ancient philosophy. (shrink)