佛祖統紀 3.18

3.18

二經同明開顯並屬醍醐。故合為一時。此並從經標名。法華具云妙法蓮華經。由妙法有施開廢三者之義。故以蓮華為喻。涅槃者。具云摩訶般涅槃經。此翻大滅度。大即法身。滅即解脫。度即般若。一經始終。純談三德。

Because both sutras equally clarify the opening and revealing, and both belong to clarified butter, they are combined into one period. These are both designated by the names of the sutras. The Lotus [Sutra] in full is called the Saddharmapuṇḍarīka Sūtra. Because the wondrous Dharma has the three senses of applying, opening, and discarding, the lotus is used as a metaphor. As for Nirvāṇa, in full it is called the Mahāparinirvāṇa Sūtra. Here this translates as great extinction and crossing over: great is the Dharma-body; extinction is liberation; crossing over is prajñā. From beginning to end, this single sutra purely discusses the three virtues.