金剛般若經依天親菩薩論贊略釋秦本義記卷上 1.36

1.36

[Sūtra:] "Subhūti, can the space of the south, west, north, the four intermediate directions, above, and below be measured?" The second part broadly cites the nine directions. The text again has two parts, the names and meanings being as above. This is the first part, the Tathāgata's question. "The four intermediate directions" has the meaning of non-cardinal directions.