The end of the Parsha speaks about the Milu’im [the Korbanos that Ahron had to bring for seven days before becoming Cohen Gadol]. “Milu’im" means “filling” someone’s hands with a new position. We can suggest that the word Milu’im hints at being a “full” person.
We remember that Ahron was happy with his brother’s greatness. Because of this Simcha, he was Zoche to become the Cohen Gadol. In order to be happy with someone else’s greatness, a person needs to be very “full” himself, and feel that whatever Hashem gives him is perfect for him. Learning Mussar and Shaar HaBitachon constantly, inspires a person to be happy, by realizing that his situation is perfect, and a little more or a bit less would not be good for him!
You Should Feel “Full” And Great in Your Avodas Hashem, Since You Try Your Best
Reb Moshe Feinstein says that although Ahron was not as great as Moshe, since Ahron tried his best, they were considered equals. A person who does his best is already a great person.
We can say this Korban is called Milu’im, because in order to become the leader and the greatest of Cohanim, Ahron needed a pure heart full of Simcha; a “full” person, not an empty person.
When You Are at Peace with Yourself and Have That “Full” Feeling, Others Can Enjoy and Be Happy with You
Korban Shelamim is called its name since it brings Shalom peace to the world. Also, everyone gets a portion and becomes satisfied; the Mizbeach, the Cohanim, and the owner.
The difference between Shelamim and other Korbanos, is that other Korbanos are brought because of Chet, whereas Shelamim is not brought for any sins. The word Chet literally means missing, as we find in the end of Sefer Shoftim the story about 700 archers from Shevet Binyamin who were such expert sharp-shooters that: אִטֲחַי אֹלְו they never “missed” their mark.
The Yid who is bringing a Shelamim [not for ֵח ְט א missing] is a ָשׁ ֵלם whole. He is full. He comes with a good feeling, like he has everything a person could have. He is at peace with himself, and with the rest of the world. It is just such a Korban that everyone can enjoy and be happy with.
By Not Being Involved with Teva You Can Be Zocheh to The Biggest Nissim
A friend of mine was disliked in a certain Mosad, and he needed a new job. But his chances didn’t seem hopeful, since the Mosad was besmirching him plenty. I told him not to be Nis'pael, and Hashem will surely give him a new and better job. He decided not to be involved in Tevah [cause and effect]. One day, a Menahel from another Mosad spent a long time in the office, chatting with the Menahel of the old Mosad, who was his arch enemy...
Low and behold! The new Menahel offered him a job on the spot, as soon as he walked out of the office. Till today, he still doesn’t understand what happened. I know another Yungerman who was offered a job the same day that the boss’s assistant criticized him right in front of his boss about his inabilities to perform. Imagine! The boss gives him a job right after hearing how terrible he is!
I know a Ma'aseh of a certain Melamed in Bnei Brak, where a powerful parent disliked him like poison [he was indeed failing in his job] and called up the whole world to tell them how bad he was. Instead of worrying, he actually told his Menahel about this! It was total recklessness and suicide, but Baalei Bitachon are in their own world....
Not only didn’t the Menahel go against him, but it “happened to be” that this Menahel disliked that parent, and he became a good friend of this Melamed as a result of having a common enemy!
