Father Sergius by Leo Tolstoy, Fiction, Literary

In Petersburg in the eighteen-forties a surprising event occurred. An officer of the Cuirassier Life Guards, a handsome prince who everyone predicted would become aide-de-camp to the Emperor Nicholas I and have a brilliant career, left the service, broke off his engagement to a beautiful maid of honor, a favorite of the Empress's, gave his small estate to his sister, and retired to a monastery to become a monk. This event appeared extraordinary and inexplicable to those who did not know his inner motives, but for Prince Stepan Kasatsky himself it all occurred so naturally . . .