This is what is said in the Haftorah of Parshas Vayigash (Yechezkel 37:16-24):
[Hashem told Yechezkal:] take for yourself one stick and write upon it, ‘For Yehuda and the Children of Yisroel his allies,’ and take one stick and write upon it, ‘For Yosef, the staff of Efraim and the entire House of Yisroel his allies.’ And bring them close, one to the other to become one stick...See now, that I will take the staff of Yosef...and I will place them with the staff of Judah and I shall make them into one staff in My Hands...And My servant Dovid shall be king over them, and there shall be one shepherd for all of them...”
Meaning: currently, Yosef is higher than Yehuda. Since he is compared to a cedar tree which continually grows tall. This is unlike Yehuda who is compared to the ground that stays in one place unchanging.
Similarly, Yosef ruled over ten tribes, unlike Yehuda who only ruled over two tribes. As it is written (ibid 19): “[Hashem says:] See, I will take the staff of Yosef in the hand of Efraim and the tribes of Yisrael his allies, and I will join them with the staff of Yehuda.” In this verse, Yosef is described as having the “tribes of Yisrael” as his allies, whereas Yehuda described by himself, since he only ruled over his own tribe and that of Binyamin, whereas Yosef ruled over the vast majority of the tribes.
We see from here that he (Yosef) has more tribes than Yehuda. This is why he is named “Yosef,” since his name means to “increase” and spread everywhere, similar to how Yosef’s descendants took over the rulership of the vast majority of the Jewish People.
This ability to increase in all matters physical and spiritual is because his (Yosef’s) level of “Yesod-outward connection” reaches the “Higher level of ‘Daas-inward connection.’” The two levels of connection described here are: “Yesod-outward connection” means connecting to someone outside of yourself. This can be in teaching an idea, or giving someone something. Even when the husband gives his wife the ability to have children, he is connecting to someone else other than himself. “Daas-inward connection” is how a person connects two parts of himself together, and discovers and even deeper part of himself. This happens in two ways: When a person takes his knowledge and contemplates upon it until it connects to his emotions. For example, he reflects upon the fact that he is a Jew and Hashem loves...
