Rabbi Moriah Panker, head of the Paninat Or Midrash, explained in her lesson that even today - we must be happy, along with the great sadness. According to Rabbi Pankar, in the Book of Esther, which we read on Purim - the name of the Holy One, blessed be He, does not appear even once, indeed.
A scroll that is hidden. And sometimes we experience difficult and complex times - but within the hidden - we find a Creator of the world, who sees us.