Duppaññasutta
Atha kho aññataro bhikkhu yena bhagavā tenupasaṅkami …pe… ekamantaṁ nisinno kho so bhikkhu bhagavantaṁ etadavoca: “‘duppañño eḷamūgo, duppañño eḷamūgo’ti, bhante, vuccati. Kittāvatā nu kho, bhante, ‘duppañño eḷamūgo’ti vuccatī”ti? “Sattannaṁ kho, bhikkhu, bojjhaṅgānaṁ abhāvitattā abahulīkatattā ‘duppañño eḷamūgo’ti vuccati. Katamesaṁ sattannaṁ? Satisambojjhaṅgassa …pe… upekkhāsambojjhaṅgassa— imesaṁ kho, bhikkhu, sattannaṁ bojjhaṅgānaṁ abhāvitattā abahulīkatattā ‘duppañño eḷamūgo’ti vuccatī”ti.
Witless
Then a mendicant went up to the Buddha … and asked him, “Sir, they speak of ‘a witless idiot’. How is a witless idiot defined?” “Mendicant, they’re called a witless idiot because they haven’t developed and cultivated the seven awakening factors. What seven? The awakening factors of mindfulness, investigation of principles, energy, rapture, tranquility, immersion, and equanimity. They’re called a witless idiot because they haven’t developed and cultivated these seven awakening factors.”