This passage from the Mishna in Peah states, “These are the things for which a person eats the fruits [of their reward] in this world, and the principle remains intact for him in The World to Come:… Bringing peace between a person and his fellow…”
 This teaching is found in Yalkut Shimoni, Parshas Korach, Remez 752, on the pasuk, “Va’yakhilu al Moshe…”
 The full pasuk reads, “Remove yourself from evil and do good, seek out peace and pursue it.” (Tehillim: 44; 15)
The MaLBI”M explains that this pasuk is referring to an inhabited area, for in an uninhabited area, one cannot find that which is evil to avoid and that which is good which can be performed. Therefore, one should not say that in order to seek out peace, they will escape to an uninhabited area; rather, he should be around other people, even if they are likely to come to quarrel. For, with those people, one should seek to instill peace. The MaLBI”M points out that David, when writing this chapter of Tehillim, had in mind that it refer to Doeg. Doeg spoke Lashon HaRa against Nov, the city of Kohanim, leading Shaul to order Doeg to wipe out the city of Kohanim. RaSh”I, quoting the teaching of our Sages from the Yerushalmi (maseches Peah, 4a, chapter 1, halacha 1), states that one should seek out peace in one’s place and pursue it in another place.
From the above, we learn that peace is something which must be pursued and concerning which one must invest effort, in order to bring about peace.
Rav Tivyumi states in the above section from maseches Peah, that one who pursues peace receives honor in this world as well as life in The World to Come.
The Yerushalmi states as follows:
“And acts of kindness: For it is written, “One who pursues righteousness (MaLBI”M – i.e. performs the mitzvos between man and HaShem) and kindness, will find life, righteousness, and honor.” (Mishlei: 21; 21) [He will find] honor in this world and life in The World to Come… And bringing peace between a man and his fellow: It is written, “Remove yourself from evil and perform that which is good, seek out peace and pursue it.” (Tehillim: 44; 15) Seek it in your place, and pursue it in another place. Rav Tavyumi said, ‘It says here, [in Tehillim], “pursue”, and it says above, [in Mishlei], “pursue”. Just as the “pursuing” over there [in Mishlei, refers to] honor in this world and life in The World to Come, so too, over here, [with respect to the pasuk in Tehillim], this is the case.”
 Note from the “Kol HaLashon” Hebrew printing of sefer “Shmiras HaLashon”: “This [teaching] is found in sefer “Ma’alos HaMiddos”, “Ma’alas HaShalom”, pg. 321, in the Eshkol printing. [In sefer “Ma'alos HaMiddos” it does not state] that [this teaching] is written in the name of our Sages of Blessed Memory…”