De Vita Beata by Seneca
A Stoic philosophical essay exploring the nature of happiness. Seneca argues that true happiness stems from virtue, wisdom, and self-control rather than external wealth or pleasure, emphasizing the importance of inner peace and rational living in achieving a fulfilled life.

Seneca (4 BCE–65 CE) was a Roman Stoic philosopher, statesman, and playwright, known for works like Letters to Lucilius. His writings explore ethics, self-control, and the art of living with wisdom and virtue. His Stoic philosophy continues to inspire modern self-improvement literature.