Christ did not cease until the end to correct the one who was about to betray Him

Christ did not cease until the end to correct the one who was about to betray Him. So while He knew that Judas would not give up treason, He did not cease with advice, with favors, with threats, with every method of teaching to restrain him from treason and to restrain him constantly with the word, as with a bridle. And this He did to teach us, that even though we still know in advance that the brothers will not be convinced, we do everything that depends on us, since we will receive our full reward for the advice we gave. - St. John Chrysostom