大般涅槃經集解 54.11

54.11

案僧亮曰：敘佛吼之義，初身力智是果也，三行是其本。佛具此眾德，故能吼也。四足是戒，三行譬巖穴。振尾出聲者，出大悲之事。寶亮曰：身者，法身也。力者，十力也。牙齒者，一切種智用也。四足者，四如意足也。安住巖穴者，四禪深寂也。振尾出聲者，大慈悲也。

Sengliang comments: Explaining the meaning of the Buddha's roar: first, bodily strength and wisdom are the fruit, and the three practices are their foundation. The Buddha is endowed with these many virtues, and therefore can roar. The four feet are moral discipline; the three practices are compared to the rock cavern. Shaking the tail and uttering the sound refers to the activities of great compassion. Baoliang says: The body is the dharmakāya. Strength refers to the ten powers. The teeth are the functions of sarvākārajñatā. The four feet are the four bases of psychic power (ṛddhipāda). Abiding safely in the rock cavern is the profound tranquility of the four dhyānas. Shaking the tail and uttering the sound is great loving-kindness and compassion.