성학십도 is a historical Korean text written by 이이 (Lee Yi) during the Joseon Dynasty. It serves as a guide to Confucian principles and moral education, emphasizing the importance of character development and ethical behavior in society. The title translates to "Ten Diagrams on the Study of Human Nature," and it consists of ten illustrations that depict various aspects of human relationships and virtues. This work has been influential in shaping Confucian thought in Korea and is often studied in the context of Korean philosophy and education.