Like the 'Meditations' of Marcus Aurelius, Seneca's 'Letters' are a treasure of practical wisdom on how to live and enjoy life. The focus is on living a simple, stress-free life thorough the use of rationalism. The letters provide practical steps for people to deal with the human suffering that comes with life's problems. Topics featured range from discussions on the shortness of life and anger to immortality and death. The 'Letters' are part of the foundation of Stoic thought making Seneca one of the indispensable thinkers from Ancient Roman philosophy.