[594] Which is that form (rūpa) that is internal, not a primary element (mahābhūta)?
The eye sense base (cakkhāyatana) … the body sense base (kāyāyatana) — this is that form that is internal, not a primary element.
Which is that form that is external, a primary element?
The tangible sense base (phoṭṭhabbāyatana), the water element (āpodhātu) — this is that form that is external, a primary element.
Which is that form that is external, not a primary element?
The form sense base (rūpāyatana) … edible food (kabaḷīkāro āhāro) — this is that form that is external, not a primary element.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.