Musar literature is didactic Jewish ethical literature which describes virtues and vices and the path towards character improvement. This literature gives the name to the Musar movement, in 19th century Lithuania, but this article considers such literature more broadly. Definition Musar literature is often described as "ethical literature." Professor Geoffrey Claussen describes it as "Jewish literature that discusses virtue and character." Professors Isaiah Tishby and Joseph Dan have described it as "prose literature that presents to a wide public views, ideas, and ways of life in order to shape the everyday behavior, thought, and beliefs of this public." Musar literature traditionally depicts the nature of moral and spiritual perfection in a methodical way. It is "divided according to the component parts of the ideal righteous way of life; the material is treated methodically – analyzing, explaining, and demonstrating how to achieve each moral virtue (usually treated in a separate chapter or section) in the author's ethical system." Musar literature can be distinguished from other forms of Jewish ethical literature such as aggadic narrative and halakhic literature. Early Musar literature In Judaism, ethical monotheism originated, and along with it came the highly didactic ethics in the Torah and Tanach. Mishlei is commonly regarded as a musar classic in its own right and is arguably the first true "musar sefer." In fact, the Hebrew word musar (מוסר, discipline) being the title of this genre stems from the word's extensive use in the book of Mishlei. An example from the Tanakh is the earliest known text of the positive form of the famous "Golden Rule": Hillel the Elder (c. 110 BCE – 10 CE), used this verse as a most important message of the Torah for his teachings. Once, he was challenged by a ger toshav who asked to be converted under the condition that the Torah be explained to him while he stood on one foot. Hillel accepted him as a candidate for conversion to Judaism but, drawing on , briefed the man: Pirkei Avot is a compilation of the ethical teachings and maxims of the Rabbis of the Mishnaic period. It is part of didactic Jewish ethical Musar literature. Because of its contents, it is also called Ethics of the Fathers. The teachings of Pirkei Avot appear in the Mishnaic tractate of Avot, the second-to-last tractate in the order of Nezikin in the Mishnah. Pirkei Avot is unique in that it