The Musar movement is an ethical, educational, and cultural movement in Judaism that developed in 19th-century Lithuania, particularly among Orthodox Lithuanian Jews. Musar is derived from Proverbs 1:2, wherein the author of the book of Proverbs uses the term to describe moral behavior, instruction, and discipline, with an emphasis on educating oneself about how to act properly. The term was used by the originators of the Musar movement to convey teachings regarding ethical and spiritual paths found in the Musar literature. The Musar movement made significant contributions to the Musar literature and Jewish ethics. The movement was revived in the 21st century among Jews of all denominations, particularly in the United States.