We think of life as sad, depressing, and spiritual practice as difficult as well. Some feel they are forced to reject  large aspects of what hey really like and  who they are are. This mitzvah says otherwise. It is a great practice to be happy and rejoice, especially during  difficult situations. We not only lift ourselves then, but all we engage with. We become able to see the beauty in all that is happening, and not get caught in the web of pain that keeps us frozen. What strength it takes to celebrate life, to dance and sing, to allow healing to stream in.