瑜伽師地論略纂 7.32

7.32

「顯示最上一種，能為涅槃安住因緣」者，釋一能趣涅槃，漸次為因緣義，因緣義通上兩句故。無漏慧一種，三中最上，亦是二因緣所生極果，名為最上。

'Revealing the single supreme kind, capable of serving as the cause and condition for dwelling in nirvāṇa': this explains that one [training] can lead to nirvāṇa, sequentially having the meaning of cause and condition, because the meaning of cause and condition applies to the above two lines. The single undefiled wisdom is the supreme among the three, and is also the ultimate fruit produced by the two causes and conditions; hence it is called 'supreme'.