大般涅槃經義記 7.393

7.393

次辯修五，先問，後釋。釋中，「五定」總以標舉。次列五名，五中，前四是其事定：「知定」初禪與覺觀俱，故名為知；「寂定」二禪，覺觀止息，故說為寂；「身心快樂」是第三禪，彼樂最勝，故名快樂；「無樂」四禪，乃至非想。「首楞嚴」者是其理定，名如下釋。「修是五」下明修利益，「是故」下結。

Next is to explain cultivating the five: first questioning, then explaining. In the explanation, "five concentrations" presents the general heading. Next, it lists the five names; among the five, the first four are concentrations of phenomena: "concentration of knowing" is the first dhyāna, which is associated with directed and sustained thought, hence named knowing; "concentration of stillness" is the second dhyāna, in which directed and sustained thought cease, hence called stillness; "physical and mental joy" is the third dhyāna, where that pleasure is supreme, hence named joy; "absence of pleasure" is the fourth dhyāna up to [the sphere of] neither perception nor non-perception. "Śūraṅgama" is the concentration of principle, its name being explained as below. The passage beginning with "cultivating these five" clarifies the benefits of cultivation; the passage beginning with "for this reason" concludes.