[898] Which phenomena (dhammā) have internal objects (ajjhattārammaṇā)?
The sphere of infinity of consciousness (viññāṇañcāyatana) and the sphere of neither perception nor non-perception (nevasaññānāsaññāyatana) — these phenomena have internal objects.
Which phenomena have external objects (bahiddhārammaṇā)?
The three and the four jhānas (tikacatukkajjhānā) of the form sphere (rūpāvacara), as wholesome (kusala), as resultant (vipāka), and as functional (kiriyā); the resultant of the fourth jhāna; the sphere of infinity of space (ākāsānañcāyatana); the four paths that are not included [in any sphere] (apariyāpanna); and the four fruits of the ascetic life (sāmaññaphala) — these phenomena have external objects.
Setting aside form (rūpa), all phenomena of the sense sphere (kāmāvacara) — wholesome, unwholesome (akusala), and indeterminate (abyākata) — and the fourth jhāna of the form sphere, as wholesome and as functional: these phenomena may have internal objects, may have external objects, may have both internal and external objects (ajjhattabahiddhārammaṇā).
The sphere of nothingness (ākiñcaññāyatana) should not be said either to have internal objects, or to have external objects, or to have both internal and external objects.
Form and Nibbāna are without an object (anārammaṇā).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.