This book is 5 books in one, and will be the only text on Stoicism you'll ever need. All the essentials are here: the short exhortations of Epictetus, the practical lectures of Musonius Rufus, the inspiring writings of Seneca the younger, and Marcus Aurelius' famous Meditations. The lessons here are utilitarian and focus on self-discipline both mental and physical, living in harmony with reason, forbearance, and other topics.