The three greatnesses of the innately enlightened mind of sentient beings， as originally taught in the Awakening of Faith 起信论. The first is the greatness of essence 体大， which refers to the basic quality of the mind being suchness. The second is the greatness of attributes 相大， which refers to the myriad virtues possessed by the tatha^gatagarbha 如来藏. The third is the greatness of function 用大， which refers to the virtuous function seen in the actualization of the mind of enlightenment. The Awakening of Faith says: 云何为三一者体大谓一切法真如平等不增减故 二者相大谓如来藏具足无量性功德故 三者用大能生一切世间出世间善因果故 ［起信论 T 1666.32.575c］