大般涅槃經集解 54.13

54.13

案僧亮曰：此四德者，頭捋吼益之相也。寶亮曰：此下正述如來應三界化眾生也。晨朝者，眾生機發開悟之謂也。赴彼之感，出四禪之穴也。頻申者，放光動地也。欠呿者，說法也。四向顧望者，譬四無礙智也。

Sengliang comments: These four virtues are the characteristics of the benefit of shaking the head and roaring. Baoliang says: Below this, it directly describes the Tathāgata responding to the three realms to transform living beings. 'Dawn' refers to living beings' capacities being aroused and opening to awakening. Responding to their resonance, he emerges from the cavern of the four dhyānas. 'Yawning and stretching' refers to emitting light and shaking the earth. 'Stretching the jaws' refers to preaching the Dharma. 'Looking around in the four directions' is a metaphor for the four unobstructed knowledges.