摩訶止觀 3.186

3.186

Furthermore, the mind's subsumption of the teachings has, briefly, two meanings: First, all sentient beings have all Dharma gates complete within their minds; the Tathāgata clearly and thoroughly discerns and illuminates their mental phenomena, expounding according to their minds, so that immeasurable teachings emerge from the mind. Second, the Tathāgata in the past practiced gradual and sudden mind-contemplation, complete in both the biased and the perfect; relying on this mind-contemplation he expounded for sentient beings, teaching and transforming his disciples to emulate the Tathāgata in breaking open the dust-mote to produce the scroll and looking up to inscribe the sutra upon empty space. Therefore, all sutra teachings are subsumed under the three calmings and three contemplations.