For Chih-i, mind contemplation is the most accessible way to approach the Ultimate Truth, because Dharma of Sentient Beings is too broad and Dharma of Buddha is too high in approaching the Ultimate Truth. Contemplating mind, on the other hand, is related to the Threefold Truth and to the all-embracing feature of the mind. As the Ultimate Truth concerns the Threefold Truth and is all embracing, mind contemplation is proved to be the ultimate approach of penetrating the Ultimate Truth. (Vol. 2, Page 81)