The … Buddha-nature as the Triple Cause (Conditional Cause, Understanding Cause, and Fundamental Cause) of Buddhahood corresponds with the Three Tracks. The Buddha-nature as the Conditional Cause of Buddhahood (Yüan-yin Fo-hsing) refers to the inherent potential and propensity for Buddhahood within all sentient beings (which allows them to practice and build up the proper causes and conditions for attaining Buddhahood), and it corresponds to the Track of the Accomplishment (Tzu-ch’eng Kui), which is to perform the deeds required to realize the wisdom of a Buddha. The Buddha-nature as the Understanding Cause of Buddhahood (Liao-yin Fo-hsing) refers to the inherent potential for wisdom in all sentient beings, and it corresponds to the Track of the Illumination of Wisdom (Kuan-chao-kui), which destroys delusions and reveals the true nature of reality. The Buddha-nature as the Fundamental Cause of Buddhahood (Cheng-yin Fo-hsing) refers to the fact that all beings are inherently endowed with the Ultimate Truth where they all participate in the true nature of reality, and it corresponds to the Track of the Real Nature (Chen-hsin-kui), which is non-illusory and non-differentiated. See Swanson, Foundations of T’ien-t’ai Philosophy, pp. 133-134, and p.306, note 201; Lee Chih-fu, Miao-fa Lienhua-ching Hsüan-i Yen-chiu, vol. 1, pp. 185-186. (Vol. 2, Page 88)