Visuddhimagga X-11

Ayaṃ pana viseso,

但以下这些是其差别，

Ñ(X,11): There is, however, this difference.

evaṃ uppanne arūpāvacaracitte so bhikkhu yathā nāma yānapputoḷi kumbhimukhādīnaṃ aññataraṃ nīlapilotikāya vā pītalohitodātādīnaṃ vā aññatarāya pilotikāya bandhitvā pekkhamāno puriso vātavegena vā aññena vā kenaci apanītāya pilotikāya ākāsaṃyeva pekkhamāno tiṭṭheyya, evameva pubbe kasiṇamaṇḍalaṃ jhānacakkhunā pekkhamāno viharitvā ‘‘ākāso ākāso’’ti iminā parikammamanasikārena sahasā apanīte tasmiṃ nimitte ākāsaññeva pekkhamāno viharati.

即如是生起无色界心之时的比丘，譬如观瞻以青布或黄或赤或白等任何的布所系缚住的车门或袋或瓮等的口的人，忽给疾风或任何人除去了布的时候，则他当见虚空，同样的，先以禅眼而观遍的曼陀罗而住，次以「虚空！虚空！」的遍作（准备）而作意急急地除去那（曼陀罗）相时，则仅观虚空而住了。

Ñ: When the immaterial-sphere consciousness has arisen in this way, the bhikkhu, who has been formerly looking at the kasiṇa disk with the jhāna eye, finds himself looking at only space after that sign has been abruptly removed by the attention given in the preliminary work thus 'space, space'. He is like a man who has plugged an opening in a [covered] vehicle, a sack or a pot with a piece of blue rag or with a piece of rag of some such colour as yellow, red or white and is looking at that, and then when the rag is removed by the force of the wind or by some other agency, he finds himself looking at space.