[1396] One who fully understands the eye faculty (cakkhundriya) — has that one developed the faculty "I shall come to know the unknown" (anaññātaññassāmītindriya)?
Yes.
Or rather, one who has developed the faculty "I shall come to know the unknown" — does that one fully understand the eye faculty?
Six persons have developed the faculty "I shall come to know the unknown," but they do not fully understand the eye faculty; the one endowed with the highest path (aggamaggasamaṅgī) has both developed the faculty "I shall come to know the unknown" and fully understands the eye faculty.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.