Musar do Liczb 22:30

ולא יכלו אחיו לענות אותו . We find in Bereshit Rabbah (93,10), that this verse teaches us how impossible it is to confront those who admonish us. Bileam, the wisest of the Gentiles, could not justify himself before his ass (Numbers 22,30), and Joseph, the youngest of the brothers, silenced his older brothers when he confronted them with admonitions. In due course, G–d will admonish each one of us individually (Psalms 50,21 "I shall censure you and confront you with charges"). The Zohar comments at length on 43,18, describing the brothers' fear when escorted to Joseph's private residence (Sullam edition Miketz page 53). "Woe to those who neither know nor bother to study the Torah. G–d will demand an accounting from them. Body and soul will both have to answer for their deeds before they are finally separated."