The peace of the text is a gem with many facets, but in considering its many-sidedness we must remember that its main bearing is toward God. The deepest, best, and most worthy peace of the soul is its rest towards the Lord God, Himself.
Who is this “Lord of peace” but the Lord Jesus, the Prince of peace, born into the world when there was peace all over the world? It was but a little interval in which the gates of the temple of war were closed, and lo, Jesus came to Bethlehem and angels sang, “Peace on earth.” He came to establish an empire of peace which shall be universal and under whose influence they shall hang the useless helmet high and study war no more. “The Prince of peace!” How blessed is the title! So was it written of old by Isaiah, and Paul, the true successor of Isaiah, changing but a word, now speaks of, “the Lord of peace.” This is He who, being in Himself essential peace, undertook to be the Father’s great Ambassador, and having made peace by the blood of His cross, ended the strife between man and his offended Maker. This is He who is our peace—who has made Jew and Gentile one, and has broken down the middle wall of partition which stood between us. This is the Lord who, when He stood in the midst of His disciples, gave them peace by saying, “Peace be unto you.” And this is He, who in His departure made His last will and testament and wrote therein this grand legacy, “Peace I leave with you, My peace I give unto you; not as the world gives give I unto you.” This is that Lord of peace to whom it is part of His nature and office to give peace. — CH Spurgeon