Antevāsikasutta
“Anantevāsikamidaṁ, bhikkhave, brahmacariyaṁ vussati anācariyakaṁ. Santevāsiko, bhikkhave, bhikkhu sācariyako dukkhaṁ na phāsu viharati. Anantevāsiko, bhikkhave, bhikkhu anācariyako sukhaṁ phāsu viharati. Kathañca, bhikkhu, santevāsiko sācariyako dukkhaṁ na phāsu viharati? Idha, bhikkhave, bhikkhuno cakkhunā rūpaṁ disvā uppajjanti pāpakā akusalā dhammā sarasaṅkappā saṁyojaniyā. Tyāssa anto vasanti, antassa vasanti pāpakā akusalā dhammāti. Tasmā santevāsikoti vuccati. Te naṁ samudācaranti, samudācaranti naṁ pāpakā akusalā dhammāti. Tasmā sācariyakoti vuccati …pe….
A Resident Pupil
“Mendicants, this spiritual life is lived without a resident pupil and without a teaching master. A mendicant who lives with a resident pupil and a teaching master lives in suffering and discomfort. A mendicant who lives without a resident pupil and a teaching master lives in happiness and comfort. And how does a mendicant who lives with a resident pupil and a teaching master live in suffering and discomfort? When a mendicant sees a sight with their eyes, bad, unskillful phenomena arise: memories and thoughts that tighten the fetters. Those qualities reside within. Since they have bad unskillful qualities residing within, they’re said to have a resident pupil. Those qualities master them. Since they’re mastered by bad unskillful qualities, they’re said to have a teaching master.