Likutei Sichos, vol 31, Purim 1, part 2, Rabbi Chaim Wolosow
Finding the Shepherd in the Garment of Nature Why was Shushan’s joy at Ahasuerus's party a capital offense? The Rebbe explains that by "delighting" in a celebration of the Temple's destruction, Jews traded Divine protection for natural logic. Purim teaches us that while we must act within nature, it is merely a "garment" for a miracle that transcends it.