俱舍論記 2.50

2.50

「此應名曰至謂即是伺」者，答。此應名曰無伺唯尋，第四句攝。無第二伺，故名無伺。但尋相應，故言有尋。由此攝法盡，故言有尋伺地。有四品法，如文可知。順地作法故，俱句在初，一單第二，俱非第三，一單第四。地中無別無伺唯尋，故此單句第四。所以頌文但說前三，不言第四者，《顯宗》云「然法少故頌中不說。」

Regarding "This should be called... that is to say, it is investigation (vicāra)": This is the answer. This should be named "without investigation, with reflection only" (avicāra-savitarka), subsumed under the fourth phrase. Because there is no second investigation, it is called "without investigation"; because it is associated solely with reflection, it is stated to be "with reflection." Because this completely encompasses all factors, it is called the level with reflection and investigation (savitarka-savicāra-bhūmi). It contains factors of four categories, as can be known from the text. In accordance with the formulation of the level, the dual phrase comes first, a single phrase second, neither-dual third, and a single phrase fourth. Since within this level there is no distinct [level of] "without investigation, with reflection only," this single phrase is placed fourth. As to why the verse mentions only the first three and does not mention the fourth, the *Xianzong lun* states: "Yet because the factors are few, it is not mentioned in the verse."