The Chapter on Fools
AN 2.21–31 Bālavagga
21. "Mendicants, there are two fools. What two? One who doesn’t recognize when they’ve made a mistake. And one who doesn’t properly accept the confession of someone who’s made a mistake. These are the two fools.
There are two who are astute. What two? One who recognizes when they’ve made a mistake. And one who properly accepts the confession of someone who’s made a mistake. These are the two who are astute."