The Zohar, Chapter “BaHar (On Mount Sinai),” Item 63: “You may use them as slaves forever.” It is a Mitzva [commandment] to enslave a Canaanite slave. They are from the side of Ham, who performed incest, as it is written, “Cursed be Canaan; a servant of servants shall he be unto his brothers…”
To be a slave is also a correction. A desire that could be forced to obey the power of the corrected desires is called “a slave that is close to his master.” Slavery is the form of its correction, a proper way of its existence.
For the time being, I am unable to be free within a certain desire, nor can I work with it for the sake of bestowal on my own. I can only attribute it to my other desire. Such a desire can also be called “a child,” “a woman,” or “an adolescent;” it is not a “man” yet, not a “hero” who is able to “overcome” (a man, “Gever” is derived from “Itgabrut” – overcoming, surmounting).
A form of desire that is able to work only under the authority of another desire is called “a slave.”
From the 1st part of the Daily Kabbalah Lesson 4/25/10, The Zohar