釋禪波羅蜜次第法門 6.96

6.96

First, explaining the name: the reason it is called the absorption of the station of space is that this absorption initially departs from three kinds of form and the mind takes empty space as its condition; since it corresponds with formlessness, it is called the absorption of empty space. Now, this station of space and the three formless absorptions above are all subsumed under the absence of vitarka, the absence of vicāra, noble silence, and equanimity; therefore the Mahāyāna[-upadeśa] states: 'Attaining the absorption of the station of empty space, neither suffering nor pleasant, one's mind intensifies further.'