Mahāvagga

Suttapiṭaka · Khuddakanikāya · Paṭisambhidāmagga · Vol. 31 · Section 291

[291] "He knows all — as far as it extends — that is seen, heard, sensed, cognized, attained, sought after, and ranged over by the mind of the world with its devas, with its Māras, with its Brahmās, of this generation with its ascetics and brahmins, with its devas and humans": this is the knowledge of omniscience (sabbaññutañāṇa). "Therein there is no obstruction": this is the unobstructed knowledge (anāvaraṇañāṇa). There is nothing here unseen by him, nor anything uncognized or unknowable; he has directly known all that can be known (neyya); therefore the Tathāgata is the All-Seeing Eye (samantacakkhu).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.