了因佛性

The second of the three Buddha-nature "causes", i.e. 正因佛性 is the 真如 as direct cause of attaining the perfect Buddha-nature, associated with the 法身; 了因佛性 is the revealing or enlightening cause, associated with the Buddha-wisdom; 緣因佛性 is the environing cause, e.g. his goodness and merits which result in deliverance, or salvation.