Visuddhimagga X-29

Anantaṃ viññāṇanti taṃyeva ananto ākāsoti evaṃ pharitvā pavattaviññāṇaṃ ‘‘anantaṃ viññāṇa’’nti evaṃ manasikarontoti vuttaṃ hoti.

「识无边」──是说他对「虚空无边」如是遍满而起的识，而这样「识无边！识无边！」的作意。

Ñ(X,29): Unbounded consciousness: What is meant is that he gives his attention thus 'unbounded consciousness' to that same consciousness that occurred in pervading [as its object the space] as 'unbounded space'.

Manasikāravasena vā anantaṃ.

或者以作意为无边。

Ñ: Or 'unbounded' refers to the attention.

So hi tamākāsārammaṇaṃ viññāṇaṃ anavasesato manasikaronto ‘‘ananta’’nti manasi karoti.

因以虚空为所缘的识，为全部的作意，而彼比丘作意「（识）无边」。

Ñ: For when he gives attention without reserve to the consciousness that had the space as its object, then the attention he gives to it is 'unbounded'.