"Judah approached [Joseph]…." [Gen. 44:18]

The Baal Shem Tov taught:
There are two categories of people: the first category consists of people who conduct their lives according to the laws of Nature (Nature in Hebrew is "hateva," which is numerically equal to the Divine Name of Elokim), which is referred to as "Judah," [who represents the sefira of] malchut/Kingship [which is connected with the Divine Name Elokim]

The second category consists of people who live their lives above the laws of nature, alluded to in the verse: "The righteous person rules over the awe-inspiringness of Elokim," which means that the righteous person is capable of annulling Divine decrees [which cause people to be inspired with awe of G‑d]. This category is referred to as "Joseph the tzadik/righteous one." (II Sam. 23:3)

When these two categories of people come together, they unite and become one...

When these two categories of people come together, they unite and become one for the one becomes a vehicle for the other and the two levels merge into one.

This then is the meaning of, "Judah approached [Joseph]": The level of "Judah" approached the level of "Joseph" and said, "Please, my master," literally, "My master is in me," meaning that the "Joseph" level, which is above Nature (as Abraham called G‑d, Master, because He rules over Nature) is now within the level of "Judah."

Also, this is the meaning of the teaching in the Zohar: "Fortunate is the one who holds the hand of sinners" for when rebuking one's townspeople, one should first see that one has bound oneself to G*d, and then one should bind oneself to the townspeople by virtue of their inherent unified oneness with them, for at their Source, the leaders of the generation are a unified one with their contemporaries. When they do this, G‑d is then with them, and they will succeed in elevating them all to G‑d. (II 28b) Hence, when the Zohar spoke about holding the hand of sinners to elevate them, it meant that one has the immediate effect of elevating them when he gives them rebuke.

I heard from my master [the Baal Shem Tov] the same concept regarding elevating others during prayer.

[Based on Toldot Yaakov Yoseph, Vayeshev 3, Mishpatim 2,6 as printed in Keter Shem Tov.]