In his address of 25 Iyar 5743 (1983)1 the Rebbe said:

Even though peace is effected by the Holy One, as we learn from the verse2 , “And I shall grant peace in the land,” yet this is brought about only after the Jewish people do their part by “following My laws and keeping My commandments.”

Brotherly love and harmony begin with the “great axiom of the Torah,” namely, “Love your neighbor as yourself.”3 As my father-in-law, the Rebbe would say: “Love of a fellow Jew should even extend to a Jew on the other side of the world — even to someone you have never seen. And when you have an opportunity to do a favor — materially or spiritually — for this Jew, you should do it freely and with a joyful heart....” When there is harmony amongst Jews (in addition to the harmony of a Jewish home — and preceding that, a Jew’s inward harmony — between his two inclinations), then there is peace and harmony in the entire world — especially, “peace in the land” — the Land of Israel.

Similarly, in his address of the first day of Rosh Chodesh Elul 5744 (1984)4 , the Rebbe said:

When the entire Jewish people — commencing with the children — exist in harmony: Jewish love and unity, which at a simple level constitutes shleimus haAm — secondly shleimus haTorah, a state in which everyone is permeated with Torah and mitzvos, then the facilitation of shleimus haAretz is expedited as well. This means facilitating the integrity of the Land of Israel to such a degree, that no one will be able to infringe upon even the smallest part of it (even a single inch).

This tranquility not only refers to matters of Judaism — but even applies to our physical existence. This is because the Land of Israel is “the land upon which the eyes of G‑d are fixed, from the beginning of the year until the end of the year.”5 This means that every moment of every day throughout the year, one can see that the Land of Israel is saturated with G‑dliness — so much so, that even non-Jews see this clearly. Therefore, not only do they refrain from harming the Land of Israel, but on the contrary — they protect the Land of Israel from undesirable circumstances.