The battles fought between the Jews and their enemies, which took place on Adar 13 throughout the Persian empire (see "Today in Jewish History" for that date), continued for two days -- Adar 13 and 14 -- in the capital city of Shushan, where there were a greater number of Jew haters. Thus the victory celebrations in Shushan were held on the 15th of Adar, and the observance of the festival of Purim was instituted for that day in Shushan and all walled cities. (See Laws and Customs below).
On this date, in the year following the Holy Temple’s destruction, G‑d tells Ezekiel to take up a lamentation for Pharaoh, king of Egypt, and for the Jewish nation’s other enemies, foretelling their ultimate downfall.
Read the prophecy here: Ezekiel ch. 32
In cities that are surrounded by a wall dating from the days of Joshua (13th century BCE) -- a prominent example is the city of Jerusalem -- the festival of Purim is observed on the 15th of Adar (instead of the 14th), in commemoration of the fact that in the ancient walled city of Shushan, the first Purim was celebrated on this day (see "Today in Jewish History").
(For an overview of the Purim observances and links to more information, see "Laws and Customs" for Adar 14.)
Our Torah tells you that you must not fear. Even if an army is charging towards you, you must not fear. For there is no danger worse than fear.
But you are only human. Do you truly have control over the dread and panic pounding in your heart?
Yes. Not directly, but through the power of your mind. If you will choose not to dwell on those things that instill panic and dread, those emotions will wither and fade.
And the choice is yours. What do you want to speak about? What do you want to think about?
For the thoughts of your mind are the mother and the father of the emotions of your heart.