Answer: Joy is a sign of agreeing with the Creator to acquire His properties. I (the soul) obtain the properties of bestowal, the Light of Hassadim (Mercy), under the influence of Ohr Makif (the Surrouding Light) that “comes to me through the roofing of a tabernacle” thanks to the screen which I built from the “threshing-floor and winepress.”
On a threshing-floor, grain (the Light of Hassadim) is procured, and the husk remains. Wine is made in a winepress, and oil cake is left. Yet, from the waste that has no value to my egoism, I build the most precious thing in my life: the screen. That is, I raise the importance of the property of bestowal over reception particularly in these two Lights or forces of nature: Hassadim (Mercy) and Hochma (Wisdom).
I change the intention on the desire of these two Lights (fillings) from receiving to bestowing. I see value in “waste from the threshing-floor and winepress,” rise above my egoism, my evil, and prefer to exist in filling the desires of others instead of mine. I do so to subsequently reveal the Creator.
Joy signifies that I’m in the state of bestowal. It is the outcome of my completely merging with the Creator and justifying all of His actions.
From the 4th part of the Daily Kabbalah Lesson 9/21/10, Shamati #96
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