說無垢稱經疏 4.7

4.7

贊曰：下顯理窮，初徵、後顯。顯中復有二：初陳己事、後顯他詞。己事有二：初顯他問、後顯已答。此徵及顯他問也。此諸童子，婆羅門種，姓離咕毘。佛為輪王，羅怙羅繼嗣，故今讚歎亦言輪王。輪王有四，鐵、銅、銀、金，各能王彼一二三四天下人庶，如常分別。既脫屣輪帝之寶，而為出家，學出家功德有何利也？

The Commentary says: Below, revealing the exhaustion of reason: first, the interrogation, and later, the revelation. Within the revelation there are also two parts: first, stating his own affairs, and later, revealing the words of the other. His own affairs have two parts: first, revealing the other's question, and later, revealing his own answer. This is the interrogation and the revelation of the other's question. These young men were of the brahmin class, with the clan name Licchavi. The Buddha was a wheel-turning king and Rāhula was the successor to the lineage; therefore, in now praising him, they also spoke of a wheel-turning king. Wheel-turning kings are of four kinds: iron, copper, silver, and gold, each ruling respectively over the populace of one, two, three, or four continents, as usually differentiated. Having cast off the jewel of the wheel-turning emperor to leave home, what benefit is there in practicing the merits of leaving home?