Examining Seneca’s works of prose as the writings of a Stoic and placing them within the context of the Stoic system – Jula Wildberger takes on this task in the first detailed and elaborate overall and new interpretation of Stoic physics to be published in years. In a new, thematically-structured overall reconstruction of the Stoic system, bits of theory discovered in Seneca's works are classified and analysed in detail. The volume is designed to be an introductory work, as well as a handbook and a reference work.