俱舍論記 1.285

1.285

「傳說竅隙至不離晝夜」者，答。傳說竅隙空界即是明、闇，此空界色是顯色差別，非離明、闇顯色外別有竅隙可取，故空界色明、闇為體。應知此體不離晝、夜，晝以明為體、夜以闇為體，此空界色以明、闇為體，晝、夜為位。又解：空界實有者，此非論主所許。故論主言「應知此體不離晝、夜」，謂如晝、夜於明、闇等假立其體。晝、夜非實，空界亦然，應非實有。

Regarding "Tradition says apertures [...] not apart from day and night": An answer. Tradition says that the space element of apertures is precisely light and darkness; this colour of the space element is a distinction of visible form (varṇa-rūpa), and there are no apertures to be grasped separately outside of the visible forms of light and darkness; therefore, the matter of the space element has light and darkness as its substantial entity. One should know that this substantial entity is not apart from day and night: day takes light as its entity, and night takes darkness as its entity; this matter of the space element takes light and darkness as its entity, and day and night as its states. Another explanation: that the space element is a real entity is not accepted by the author of the treatise. Therefore, the author says, "One should know that this substantial entity is not apart from day and night," meaning that just as day and night are conventionally designated entities upon light, darkness, and so forth, and day and night are not real, the space element is likewise not truly real.