The Zohar, Chapter “VaYetze (And Jacob Went Out),” Item 51: …It turns out that she is like a polished mirror, which is concerned not with showing her own form, but only with the form of others, those who look at her or those who stand in front of her.
She resembles a mirror also because the whole quality of the glass mirror is the murky color in its other side. It reflects the rays of light, for if it were transparent, no shape would be seen in it. So is the Nukva—all her strength is in the Masach in her, which detains the light from shining from her down. Without this Masach, there would have been no light in her at all.
We read The Zohar but we don’t understand it; we read it but don’t feel anything. Ultimately we have to reach a state when the question “What is it all for?” will plunge us into despair, disillusionment, to an inner explosion and realization that we have no other choice but to unite, and in this inner unity, reveal what The Zohar speaks of.
There is no other method, no other path. We must overcome this barrier. There are many obstacles on our way: laziness, lack of understanding, and the mind’s protests due to its inability to comprehend. However, none of that matters. We only need persistence that brings us to a state of despair and the realization that there is no other choice. We must reveal what The Zohar speaks of precisely here in our unity. That which The Zohar describes is revealed only in the unity among us.
From the 1st part of the Daily Kabbalah Lesson 6/13/10, The Zohar