Musar על ברכות 127:13

The underlying principle of all this is that the way Torah scholars increase peace and harmony in this world is that they demonstrate that the dichotomy between body and soul must be healed, that through Torah study the body is elevated to the level of the soul and not vice-versa, G–d forbid. Through Torah study they also contribute to the harmony in the Celestial Regions. We have an allusion to this in Isaiah 27,5: או יחזיק במעוזי יעשה שלום לי שלום יעשה לי, "Or, if he holds fast to My refuge, he makes peace for Me, peace he makes for Me." The repetition of the word peace indicates that the prophet speaks about peace on earth as well as peace in the Heavens.