The spiritual head cannot be bigger than the body. A body is called a sum of all desires that I was able to connect to myself.
Every desire is a single point; two desires are two points, etc. However, if ten points come together, then the new property is manifested within them. This is how the laws descending from above act upon us. If you gather together ten points then the new, special property appears within their connection.
The minimal set is two. When there is a connection between at least two people, then a person already begins to sense something. However, ten desires connected together form a complete model similar to the final system. One can already sense the upper force in the connection of ten desires.
When it comes to two, three, or four, a person can sense only certain manifestations of the upper property of bestowal. However, when ten desires unite, we begin to sense within these manifestations their moving force, their Creator who is creates bestowal.
It turns out that within the connection of ten desires there is an opportunity to attain Keter, their root, the source.
From the 3rd part of the Daily Kabbalah Lesson 9/6/12, Talmud Eser Sefirot