Why is it that simcha, joy, breaks barriers and changes things?
The Tzemach Tzedek, the third Lubavitcher Rebbe, once visited Jewish soldiers in the czars army.
They said to him, “Rebbe, we worked to shine our buttons on our uniforms in your honor. Now please polish our souls that have become coarse and heavy.”
These were soldiers who were captured as little children and forced to work in the army.