Before the holiday of the New Year (Rosh Hashanah), during the period of repentance (Selichot), we clarify all of our egoistic desire determined as evil. Then we cut it off from the past year and wish to rise to the next year, to new changes (Rosh Hashanah).
We also realize that we are unable to do anything with ourselves; this state is called the Day of Atonement (Yom Kippur). We decide that there is one solution: to increase the importance of the quality of bestowal, which is despised by us within our egoism. We decide to raise the importance of spirituality, to not engage in our egoistic desires, and to increase the desire for bestowal. This symbolizes the holiday of Sukkot.
Take the desire for bestowal, which seems unimportant, as "waste" to you today, and elevate it according to your assessment of its importance. Do not engage in your egoistic, receptive desires, but come out into a "temporary dwelling," into the desire to bestow.
You need to come out of your familiar egoistic "home" and build a new structure so that its most important detail, the roof, will be the quality of bestowal. This shows to what extent you can equalize to the Light that is situated above the roof of the Sukkah. It will shine for you to the extent that you will be able to accept it. This is the meaning of the holiday of Sukkot.
From the 4th part of the Daily Kabbalah Lesson 9/21/10, Shamati #96