大般涅槃經集解 2.17

2.17

案僧亮曰：方有二樹，合則八也。高五丈許，上合下離，其花甚白，其實如瓶，香味具足。今以二樹鮮榮、二樹枯悴，明法不偏也。昔道場偏說，所以一樹；今日教圓，寄之雙也。法瑤曰：謂堅固林也。風霜不能改、四時莫能遷，以況法身金剛之質。老死不能變、念念不能易，常樂之相也。兼遣存常樂之意也。僧宗曰：所以名堅固者，為四天所護也。表佛所說法，四部所護，永不墜喪也。在林之間水之邊者，處林則息亂、近水則清淨，表明如來寂靜而無累也。寶亮曰：亦破著也。物情以往古諸佛皆於此處涅槃，四天所守，謂為保固。今破云：此非堅法。若能不為四魔所壞，乃至堅也。

I note that Sengliang says: "In each direction there are two trees, totaling eight. They are about fifty feet tall, joined above and separated below, their blossoms very white and their fruits like jars, fully endowed with fragrance. Now, with two trees flourishing and two trees withered, it clarifies that the Dharma is not partial. Formerly, at the place of awakening, [the Buddha] taught partially, hence there was a single tree; today the teaching is complete, metaphorically represented by the twins." Fayao says: "It means the solid forest. Wind and frost cannot alter it, and the four seasons cannot change it; this compares to the adamantine substance of the dharmakāya. Old age and death cannot change it, and moment-to-moment thought cannot alter it; this is the characteristic of permanence and bliss. It concurrently dispels the intention to cling to permanence and bliss." Sengzong says: "The reason it is called solid is that it was guarded by the four devas. This signifies that the Dharma preached by the Buddha is protected by the fourfold assembly and will never be lost. Being within the forest and by the water: being in the forest calms disturbance, and being near the water brings purity, manifesting that the Tathāgata is tranquil and without encumbrance." Baoliang says: "It also refutes clinging. Sentiments of beings held that past Buddhas all entered nirvāṇa in this place, protected by the four devas, considering it secure and firm. Now it is refuted, saying: this is not an enduring phenomenon. If one can remain uncorrupted by the four māras, only that is supreme firmness."