All thy children shall be taught of the Lord (comp. Isaiah 44:3; Jeremiah 31:33, Jeremiah 31:34; Ezekiel 11:19; Joel 2:28; Acts 2:17, Acts 2:18, etc.). Christians are all of them "taught of God" (John 6:45; 1 Thessalonians 4:9).
The "anointing," which they have from the Holy Ghost, "teaches them, and is truth, and is no lie" (1 John 2:27), and causes them to "know all things" (1 John 2:20). And great shall be the peace of thy children.
Messiah was to be "the Prince of Peace" (Isaiah 9:6). His birth heralded the coming of "peace on earth" (Luke 2:14). So far forth as men are true Christians, does peace reign in the conscience and show itself in the life.
Externally there may be persecution, tumult, wars, fightings; but internally, in each heart, there will be a "peace that passes all understanding" (Philippians 4:7). God "keeps in perfect peace" those" whose minds are stayed on him" (Isaiah 26:3).