[609] Which is that form (rūpa) that is external, not the eye sense base (cakkhāyatana)?
The form sense base (rūpāyatana) … edible food (kabaḷīkāra āhāra) — this is that form that is external, not the eye sense base.
Which is that form that is internal, the eye sense base?
The eye that is the sensitivity (pasāda) derived from the four great elements (mahābhūta) … this too is an empty village — this is that form that is internal, the eye sense base.
Which is that form that is internal, not the eye sense base?
The ear sense base (sotāyatana) … the body sense base (kāyāyatana) — this is that form that is internal, not the eye sense base.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.