Why is the attainment of Buddhahood the ultimate goal of sentient beings, and what is the significance of it? In Chih-i’s view, the goal of the Perfect Teaching that strives for Buddhahood is for liberation of all sentient beings, which differs from those of the other three teachings (Tripitaka, Common, and Separate) that are only suitable for certain type of beings with certain faculties. One may ask: “Why is the attainment of Buddhahood the universal truth for all beings?” This is because Chih-i regards the Buddha nature as the foundation for beings to attain Buddhahood. Deducing from the fact that all beings are endowed with Buddha-nature, all of them can eventually become a Buddha. Hence, Buddhahood is universal. With this single goal, all beings without exception can be led to liberation. To cause universal liberation of all beings is exactly the spirit of Mahāyāna Buddhism and is the inexhaustible motivation of bodhisattvas in entering the world to save others. The combination of striving for self-enlightenment and enlightenment of others is what makes the attainment of Buddhahood extremely meaningful and significant. (Vol. 2, Page 97-98)