The Musar movement (also Mussar movement) is a Jewish ethical, educational and cultural movement that developed in 19th century Lithuania, particularly among Orthodox Lithuanian Jews. The Hebrew term Musar (מוּסַר‎), is from the Book of Proverbs (1:2) describing moral conduct, instruction or discipline, educating oneself on how one should act in an appropriate manner. The term was used by the Musar movement to expand the teachings further regarding ethical and spiritual paths. The Musar Movement made significant contributions to Musar literature and Jewish ethics. The movement has been revived in the 21st century amongst Jews of all denominations, particularly in the United States.