Imagine you were a firefighter and you have the choice to either go into a burning building wearing a tank top or a fireproof suit. Obviously, the safe and logical choice would be to use something that is fireproof so that you won't get burned.
In this week's parsha, Hashem commanded the Kohanim to wear specific sets of clothing. He commanded the Kohen, and specifically the Kohen gadol, to dress in a different way in accordance with the job that they were to perform.
When going into a fire, the firefighter has a choice of what clothing to wear. Chassidus teaches us that the same way a firefighter has a choice of physical clothing, every person also has the choice of which spiritual garments to wear. These garments are known as thought, speech and action. If a person chooses the wrong clothing, the result would be irrational or inappropriate for the situation at hand.
A lesson one can take from this is that we have to pair the correct clothing with the right situation. Practically, the month of Adar is ripe for simcha. We simply have to put on our simcha clothing and get to work. The way we do this is by using simcha to bring light into the world thereby expelling the darkness and bringing moshiach!
All the best
Avrohom Y Ross