With regard to sūtra that means gushing spring (flan-Yungch ‘üan), Chih-i explains that the meaning “gushing spring” is a figure of speech, indicating that the meanings stemming from the teaching of the Four Siddhāntas are endless, and what flows out of the Buddha-dharma is inexhaustible. The gushing spring in terms of teaching refers to measureless meanings that flow out of one sentence in the Worldly Siddhānta. The gushing spring in terms of practice refers to measureless practices arouse by hearing the teaching of the Siddhānta for Each Person, and the teaching of the Siddhānta of Counteraction. These practices can lead one to enter the realm of wholesomeness and the Eightfold Correct Path. The gushing spring in terms of the doctrine refers to the one, by hearing the Supreme Truth, is able to understand that the principle is like empty space. The dharma as empty space cannot be conceptualized and permeates everywhere.

Chih-i adds that when these three aspects are scrutinized as the Dharmadoor, the teaching as the gushing spring refers to the eloquence of the dharma without obstruction; the practice as the gushing spring refers to the eloquence of phrases without obstruction; the doctrine as the gushing spring refers to the eloquence of the doctrine without obstruction. (Vol. 2, Page 392)