The main lesson of Purim is that we are required to have a festive meal with our neighbors, give charity, and give each other gifts.  This is to promote Jewish unity.  As Rabbi Kook mentions, the Temple will be rebuilt through senseless love.

Esther requests that the Jews fast due to the danger in her plan.  She recognizes that without God's guiding hand her plan to save them would fail.

The story of Purim tells us that the real danger to the Jewish people is not people who are evil.  We can find them easily enough, but of leaders who are venal and corruptible.  Without them the evil doers do not have a chance to do evil.

In the story of the Book of Esther all the action revolves around the fact that Mordechai refuses to bow down to Haman.  What frustrated Haman was the opposition of Mordechai.  That Mordechai stood against evil.

The institution of the Priesthood was an inherited position.  Why?  The idea was to take politics out of the service in the Tabernacle.  When politics mix with religion it is usually bad for both.  By making the priesthood inherited the Torah was accomplishing this goal.

True humility is not being quiet and living a sheltered life.  True humility is that when we take on a leadership position we remember that it not about me but getting the job done and not caring who gets credit.

The Jews are commanded to use unleavened bread in the Tabernacle.  The reason is that Egypt had invented the leavening process and one of the prime ideas behind the Torah is that we should reject Egypt, both physically and spiritually.

The Torah spends a lot of time describing how the Priests in the Taberbernacle should dress.  The reason is what they represent.  They represent God to the people and the people to God.

The pasha ends with an admonishment to the Jews that the observance of Shabbat overrides the building of the Tabernacle.  This is to teach us that as important as the Tabernacle was, without observance of Shabbat it is meaningless.

Bezalel was chosen to be the architect of the Tabernacle.  His name translates as "a shadow of God.  This is to teach us that we all have talent from God and it is up to us on how we use it.