摩訶止觀 8.37

8.37

Furthermore, contemplating afflictions, one cultivates the aids to the path: when the mind of the four components arises, it defiles the five aggregates; one aggregate comprises immeasurable aggregates, and sensation, conception, volition, and consciousness are also immeasurable. The aggregates being identical to emptiness, ordinary beings' inversions are shattered, and the small withered tree is accomplished; the aggregates being identical to the provisional, the two vehicles' inversions are shattered, and the great flourishing tree is accomplished; the aggregates being identical to the middle, setting aside the teachings of withered and flourishing, the two extremes are extinguished, and one enters great nirvāṇa. This extends to opening the three liberations and entering the cool pool.