Full of poetic justice, reversals, and God’s faithfulness, the book of Esther was written ca. 400 B.C. and originated the Jewish festivity of Purim. King Ahasuerus is identified with the king Xerxes I, who reigned from 486 to 465 B.C. The gist of the book is that although we may not always see God's hand in our lives, it's always there; God is always working according to his perfect will "behind the curtain" of mundane events.