Accayasutta
“Tīhi, bhikkhave, dhammehi samannāgato bālo veditabbo. Katamehi tīhi? Accayaṁ accayato na passati, accayaṁ accayato disvā yathādhammaṁ nappaṭikaroti, parassa kho pana accayaṁ desentassa yathādhammaṁ nappaṭiggaṇhāti. Imehi kho, bhikkhave, tīhi dhammehi samannāgato bālo veditabbo.
Mistakes
“A fool is known by three things. What three? They don’t recognize when they’ve made a mistake. When they do recognize it they don’t deal with it properly. And when someone else confesses a mistake to them, they don’t accept it properly. These are the three things by which a fool is known.