金剛三昧經論 3.71

3.71

論曰：是第二答，有喻、有合。初中江、河、淮者，喻三乘行；海喻佛道。大小異者，喻三乘心寬狹不同。深淺殊者，喻三乘智優劣有異。隨前二義，其名各別。俱在海中唯名海水者，喻其三乘同入十地法空真如，唯名佛道，沒三乘名。當知三乘差別行者，皆在地前方便道中，莫不終入真如正觀，所以三乘終無別歸，如諸教法同入一味。合喻之言，在文可見。

The commentary says: This is the second [part], the reply, which has a simile and an application. In the first, the Jiang, the He, and the Huai are similes for the practices of the three vehicles; the ocean is a simile for the Buddha-path. “Because their sizes differ” is a simile for how the minds of the three vehicles are wide or narrow. “Their depths are distinct” is a simile for how the cognitions of the three vehicles differ in superiority and inferiority. In accordance with the previous two meanings, their names are each distinct. “When they are all in the ocean, it is only called ‘ocean water’” is a simile for the three vehicles together entering the thusness of the emptiness of dharmas of the ten grounds, where it is only called the Buddha-path and the names of the three vehicles disappear. One should know that the distinct practitioners of the three vehicles are all on the path of skillful means prior to the grounds; none among them will not ultimately enter the right contemplation of thusness. Therefore, the three vehicles ultimately have no different destination, just as the various teachings and dharmas together enter the single taste. The words of the application of the simile are clear in the text.