大通方廣懺悔滅罪莊嚴成佛經 2.6

2.6

信相菩薩白佛言。世尊。當觀何事。求於大乘。佛言。善男子。當觀三界無常。以求大乘。

The Bodhisattva *Śraddhāpratibhāna addressed the Buddha, saying: "Bhagavat, what matter should one contemplate to seek the Mahāyāna?" The Buddha said: "Good son, one should contemplate the impermanence of the three realms in order to seek the Mahāyāna."