[28] Therein, which consciousness is internal (ajjhatta)?
Whatever consciousness (viññāṇa), for this or that being, is internal, personal, one's own, individual, clung-to (upādinna), namely: eye-consciousness (cakkhuviññāṇa) … mind-consciousness (manoviññāṇa) — this is called internal consciousness.
Therein, which consciousness is external (bahiddhā)?
Whatever consciousness, for this or that other being, for other persons, is internal, personal, one's own, individual, clung-to, namely: eye-consciousness … mind-consciousness — this is called external consciousness.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.