摩訶止觀 1.27

1.27

上來皆是金口誠言，三世如來所尊重法。過去過去，久遠久遠，邈無萠始；現在現在，無邊無際；未來未來，展轉不窮。若已、今、當不可思議，當知止觀諸佛之師。以法常故，諸佛亦常，樂、我、淨等亦復如是。如是引證，寧不信乎？

All the above are true words from the golden mouth [of the Buddha], the Dharma reverenced by the Tathāgatas of the three periods of time. The past of the past is far distant and ancient, having no discernable beginning; the present of the present is boundless and limitlessly vast; the future of the future unfolds successively without end. If the past, present, and future are inconceivable, one should know that calming and contemplation is the teacher of all Buddhas. Because the Dharma is eternal, all Buddhas are also eternal, and bliss, self, and purity are likewise so. With such citations and proofs, how could one not believe?