True wisdom means to gradually develop a set of ideas and to understand the consequences of these ideas and how they interrelate. As we build, we begin to see how the new ideas relate to the old ideas and vice versa. Yechida is the soul that gives a person the capacity to see from one end of the world to the other. The process of Mashiach Ben David is to bring down light by doing mitzvos through free will. The process of Mashiach Ben Yosef is to do a mitzvah when it's much more difficult, which requires a much more powerful level of devotion and self-sacrifice. If you can manifest free will in a klipa, the test is bigger because of the consequences involved.