And sometimes the opposite happens: Someone who usually does bad things can do a mitzvah, and sometimes it goes up to inspire someone else, while the one who did the mitzvah remains uninspired.
Every person should think that the bad that he finds in himself is from his own bad decisions and any unholy things that he connected to, and the good that he finds in himself, might really be from someone else whose good deeds elevated him.
But, when he looks at his friends, he should think the opposite: The bad he sees in other people, maybe it’s from his own unholiness that came down to affect these people, and that’s why they are in such a bad state. Whereas the good in them is from their own hard work.
Then, when everyone will do that, we will be truly one
Then, when everyone will do that, we will be truly one, from the bottom to the top, since each person will consider himself as the “bottom” and his friend as the “top,” and his friend will do the same thing back to him, with each person subduing their own ego.
Then, Aharon, the Kohen Gadol will be able to light the fire of Hashem in all the seven lamps of the Menorah, in all the seven groups of the Jewish People, since he is the “Kohen Gadol,” which corresponds to Hashem’s attribute of “Abundant Kindness” that contains all Kindnesses.
He will be able to draw down the “infinite love of Hashem” into our “love of Hashem based on His creation of the world,” and our entire being will be permeated with a revealed love of Hashem in our heart like a flaming fire.
This is the idea behind the first verse of the Parsha, “When you (Aharon) will cause the flames of the Menorah to go up...” Meaning that Aharon will elevate them - every Jew - who makes himself into a spiritual Menorah, by drawing down into them an intense love for Hashem.