法苑珠林 20.15

20.15

述曰。既知聖教禮佛功德不可思議。是故行者常須作意不得自墮。恐無常忽至瞻禮無處。譬鼠入角路窮何趣。是故經中世尊說偈云。

The commentary states: Since we know that the holy teaching says the merit of prostrating to the Buddha is inconceivable, practitioners must constantly apply their minds and must not allow themselves to fall into laxity. One should fear that impermanence will arrive suddenly, leaving no place to gaze upon and pay homage [to the Buddha]—just as when a rat enters a horn, the path comes to an end, and where can it turn? For this reason, the World-Honoured One spoke a verse in a sūtra, saying: