The Zohar, Chapter “VaYetze (And Jacob Went Out),” Item 190: “How manifold are Your works, O Lord! In wisdom You have made them all.” “How manifold are Your works, O Lord” indicates that there is no number to them, meaning Mochin de Hassadim [Light of Mercy]. “In wisdom You have made them all” indicates the Mochin of a number, of Hochma.
It is impossible to count Hassadim because there is no restriction on the property of bestowal and love; there is no thickness (Aviut) of the desire, screens, or height. Even if we do count Hassadim, we do so according to the Light of Hochma, the receiving desires (Kelim) on the basis of which we acquire Hassadim. Yet, there is no count for the Light of Hassadim itself; there is no restriction on it or measurement for it.
From the 2nd part of the Daily Kabbalah Lesson 6/29/10, The Zohar