Parshas VaYigash: Rav Moshe Shternbuch -
The Medrash says that when Judgement day comes, we will not be able to stand up to the "Tochacha" - the rebuke from Hashem. We learn this from the Shvatim who couldn't bear the embarrassment of learning that Yosef was alive.
Rav Moshe Shternbuch says that we see from here that the most painful rebuke is not a good screaming at, but rather being forced to confront the truth. Yosef did not scream or threaten, rather he softly told them that he is their brother whom they tried to destroy.
Upon seeing how wrong they were, they experienced the worst embarrassment of their lives.
Similarly says Rav Shterbuch in the name of the Baal Shem Tov HaKadosh,the pasuk in Tehilim says, "Kel Nekamos Hashem". At the end of time Hashem will avenge those who have sinned against him. How?
The pasuk continues "Kel Nekamos Hofia". Hashem's revenge is simply to appear!
After all of history when Hashem finally reveals Himself openly to the entire world, everyone will be be mortally embarrassed when they grasp the lowliness for each and every one of their sins.