Серафим Саровский
Saint Seraphim of Sarov (; – ), born Prokhor Moshnin (Прохор Мошнин), is one of the most renowned Russian saints and is venerated both in the Eastern Orthodox Church and the Catholic Church. He is generally considered the greatest of the 19th-century "startsy" (elders). Seraphim extended the monastic teachings of contemplation, theoria and self-denial to the layperson. He taught that the purpose of the Christian life was to acquire the Holy Spirit. Perhaps his most popular quotation amongst Orthodox believers is "Acquire a peaceful spirit, and thousands around you will be saved."