Rabbi Raphy Hulkower points out that Achashverosh spent the entire first chapter of Megillas Esther thinking exclusively about himself. As we have seen, he took himself far too seriously. In celebrating Purim, with masks and drinking, we treat ourselves as “un-seriously” as possible. This behavior allows us to internalize the lesson of the king’s flaw. This helps explain the famously enigmatic statement of the Jewish mystics that Purim is equal (or perhaps even superior) to the holiest day of the year, Yom Kippur. They (Vilna Gaon, Ari’zal, etc.) learn this by way of allusion from the Biblical name of the Day of Redemption, Yom Kippurim, which can be translated “a day like Purim.” Internalizing the lesson of the king’s flaw will ultimately lead us to teshuva (repentance) and, like the Jews of Persia, will turn Purim into a platform for change and forgiveness on par with Yom Kippurim.