Answer: It means that there is nothing new in the world. We merely reveal or discover what already exists. All the forms are initially included in desire; all the Lights are already present in the Light.
So what is new here? What will be born between them is Man. He will appear on the border, yearning to make the right connection between the Lights and the vessels.
But until then he needs them to be different, concealed. He will connect them himself at every degree: a bit of desire followed by a bit of Light, and again and again. It is precisely man who determines the form of their unification so that their union serves bestowal.
I take desire (as much as I can) and the Light (whatever is needed for correction), and through my efforts I create a correlation between them which ensures reception for the sake of bestowal. This is the form that will become the form of Man, comprising the vessel and the Light, the two origins: “existence from existence” and “existence from absence.” This is how man forms himself.
It follows that the great variety of the Lights and vessels is included in the original design. However, their correct connection, which is Man’s form, is not predetermined. Every time we must verify this form and demand that it be actualized.
From the 4th part of the Daily Kabbalah Lesson 5/24/2011, “Preface to the Wisdom of Kabbalah”