摩訶止觀 7.164

7.164

隨喜者，名為「慶彼」。佛既三轉法輪，眾生得三世利益，我助彼喜。又我應勸化令其生善；其善自生，是故我喜。喜三世眾生福德善、三世三乘無漏善、三世諸佛從初心至入滅一切諸善，我皆隨喜，亦教他喜。如買、賣香、傍觀，三人同熏；能化、受化及隨喜者，三善均等。觀眾生惑甚可悲傷；觀眾生善應大恭敬，心常不輕。深知眾生具正、緣、了，即雖未發，會必應生；毒鼓遠近，為要當死，故敬之如佛。何者？未來諸世尊，其數無有量也。此深是隨喜意也。《法華》隨喜法、《大品》隨喜人，人、法互舉耳。

Rejoicing in others' merit means 'celebrating them.' Since the Buddha has turned the wheel of Dharma three times, sentient beings obtain benefits throughout the three times; I assist in their joy. Furthermore, I ought to exhort and transform them to make them generate goodness; when their goodness arises naturally, I therefore rejoice. Rejoicing in the wholesome merit of sentient beings of the three times, the undefiled goodness of the three vehicles of the three times, and all the goodness of the buddhas of the three times from their initial thought of awakening until their parinirvāṇa, I rejoice in all of them and also teach others to rejoice. It is like a seller, a buyer, and a bystander of incense, where all three are perfumed alike; the transformer, the transformed, and the one who rejoices share the three goodnesses equally. Contemplating the delusions of sentient beings is deeply pitiable; contemplating the goodness of sentient beings warrants great reverence, with a mind that constantly never despises. Deeply knowing that sentient beings possess the inherent cause, conditioning cause, and revealing cause [of buddha-nature]—even if these have not yet manifested, they must inevitably arise. Like the poison-smeared drum, whether heard from near or far, death is certain; therefore one reveres them like buddhas. Why? The future World-Honoured Ones are limitless in number. This is the profound meaning of rejoicing. The Lotus Sūtra rejoices in Dharma; the Pañcaviṃśatisāhasrikā Prajñāpāramitā rejoices in persons; persons and Dharma are interchangeably raised.