There's this principle, a kind of cosmic law of reciprocity. It says that when a lower partzuf—think of it as a spiritual configuration or "face" of God—causes light to shine in a higher partzuf, that lower one also gets to share in that light. It’s like this: if you help someone else achieve something great, you benefit too. Because you were the catalyst, the impetus, for the change in the higher realm, whatever good stuff emerges there also trickles down to you.

Now, this gets really interesting when we talk about Ze’er Anpin. Remember, Ze’er Anpin is a crucial partzuf in Kabbalah, often associated with the emotional attributes of God. So, according to this principle, Ze’er Anpin receives the same "brains"—that is, the same divine wisdom (Ḥokhma), understanding (Bina), and knowledge (Da’at)—from Yisrael Sabba and Tevuna. Who are they? Well, they are higher partzufim, representing more elevated aspects of the divine.

Why? Because Ze’er Anpin played a key role. It acted as the "middle line," the feminine waters, activating a greater illumination of Ḥokhma in Yisrael Sabba and Tevuna. As we explored earlier, the light of Ḥokhma, this divine wisdom, is really the animating life force within all created beings. So, by helping to bring that light forth in the higher realms, Ze’er Anpin also gets a share of it.

This, my friends, is the mystical meaning behind the saying, "Three come out of one; one exists in three." We find this idea echoed in the Zohar (Bereshit 1, section 276) and touched upon earlier. It speaks to the interconnectedness of the divine attributes, how they both differentiate and unify. It's a concept we've seen before, and one that keeps resurfacing as we delve deeper into Kabbalistic thought.

So, we see that the process of fusion, the emergence of a lower partzuf, depends on these three factors. This interplay of influence and reciprocity shapes the divine landscape, creating a dynamic and ever-evolving reality. It’s not just a one-way street; it’s a dance, a constant exchange of energy and light. What does this tell us about our own lives? Maybe that by helping others shine, we illuminate ourselves as well.