Included in this volume are the dialogues On the Shortness of Life and On Tranquility of Mind, which are eloquent classic statements of Stoic ideals of fortitude and self-reliance. This selection also features extracts from Natural Questions, Seneca's exploration of such phenomena as the cataracts of the Nile and earthquakes, and the Consolation of Helvia, in which he tenderly tries to soothe his mother's pain at their separation. For more than seventy years, Penguin has been the leading publisher of classic literature in the English-speaking world. With more than 1,700 titles, Penguin Classics represents a global bookshelf of the best works throughout history and across genres and disciplines. Readers trust the series to provide authoritative texts enhanced by introductions and notes by distinguished scholars and contemporary authors, as well as up-to-date translations by award-winning translators.