Seneca the Younger (c. 4 BCE – 65 CE) was a Roman Stoic philosopher, statesman, and playwright. Known for his moral essays and letters, Seneca emphasized self-discipline, rationality, and the pursuit of virtue, teaching that individuals should focus on mastering their emotions and accepting fate. His works, including Letters to Lucilius and On the Shortness of Life, have had a lasting influence on Stoic philosophy, providing timeless insights on how to live a meaningful and tranquil life. Seneca’s thoughts on ethics and resilience influenced later philosophers, especially during the Renaissance, and continue to shape modern ideas about mental fortitude and personal growth.