Seneca's 'On Anger' (De Ira) is a foundational text in Stoic philosophy, offering profound insights into one of humanity's most destructive emotions. Written by the Roman philosopher and statesman Lucius Annaeus Seneca, this treatise explores the nature of anger, its causes, and, most importantly, its remedies. Seneca argues that anger is not merely a fleeting emotion but a form of temporary madness that can lead to irrational actions and great suffering. He provides practical strategies and philosophical arguments for cultivating self-control and achieving inner tranquility, emphasizing the importance of reason over impulsive passions. This timeless work remains highly relevant for anyone seeking to understand and master their emotions.