Letters from a Stoic is a collection of personal letters written by the Roman philosopher Seneca to his friend Lucilius. In them, Seneca offers practical advice on how to live a virtuous and meaningful life using Stoic principles-focusing on self-control, resilience, and inner peace. The letters explore topics like dealing with hardship, the value of time, and the importance of wisdom, encouraging readers to cultivate a calm mind and moral strength regardless of external circumstances.