大般涅槃經集解 54.157

54.157

案道生曰：如菟馬者，二乘觀也。菟馬度河，不得河底，以況眾生無明所䨱，不見理也。僧亮曰：明觀淺也。不見因緣始故，不斷常見；不見因緣終故，不斷斷見也。寶亮曰：第二說三乘同觀無生，但見理不同，有深淺之異，借菟馬度河為譬也。

Daosheng comments: Being like a hare or a horse refers to the contemplation of the two vehicles. When a hare or a horse crosses a river, it does not reach the riverbed; this illustrates that sentient beings are covered by ignorance and do not see the principle. Sengliang comments: This clarifies that their contemplation is shallow. Because they do not see the beginning of causes and conditions, they do not sever the view of permanence; because they do not see the end of causes and conditions, they do not sever the view of annihilation. Baoliang comments: Secondly, it explains that the three vehicles all contemplate anutpāda, but their seeing of the principle differs, having differences of shallow and deep; the crossing of the river by a hare or a horse is borrowed as a metaphor.