Written in Greek, without any intention of publication, by the only Roman emperor who was also a philosopher, the Meditations of Marcus Aurelius (AD 121-180) offer a remarkable series of challenging spiritual reflections and exercises developed as the emperor struggled to understand himself and make sense of the universe. 
Ranging from doubt and despair to conviction and exaltation, they cover such diverse topics as the nature of moral virtue, human rationality, divine providence, and Marcus' own emotions. 

But while the Meditations were composed to provide personal consolation and encouragement, in developing his beliefs Marcus Aurelius also created one of the greatest of all works of philosophy: a timeless collection of extended meditations and short aphorisms that has been consulted and admired by statesmen, thinkers and readers through the centuries.