俱舍論疏 28.84

28.84

The Śāstra says: "For if one should question... [is the true reason for establishing the name]," which explains the reason it is not named from the preliminary application. During the preliminary application of the first three formless attainments, the mind contemplates infinite space, etc., but the fundamental state does not truly always take space as its object; because of this, they are named from their preliminary application and not from the fundamental state, since the preliminary application does not contemplate the fundamental state in its cognitive activity. In the preparatory stage of the base of neither-perception-nor-non-perception, one takes the dim and weak perception of its fundamental level as an object and thinks: 'Lacking clear and prominent perception, it has a dim and weak perception.' This thought arises relying on the fundamental state, and is itself the true reason for establishing the name. Because its perception is dim and weak, it takes its name from the fundamental state and not from the preliminary application.