Mic 4:3-4, Rom 5:1
The Old Testament prophesied that we would enjoy peace through the coming Christ. (Isa 32:16-18, Mic 4:3-4)
Isa 32:16 Then judgment shall dwell in the wilderness, and righteousness remain in the fruitful field. 17 And the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever. 18 And my people shall dwell in a peaceable habitation, and in sure dwellings, and in quiet resting places;
Mic 4:3 And he shall judge among many people, and rebuke strong nations afar off; and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up a sword against nation, neither shall they learn war any more. 4 But they shall sit every man under his vine and under his fig tree; and none shall make them afraid: for the mouth of the Lord of hosts hath spoken it.
Through Jesus, the Christ, we have peace with God and have found peace. (Romans 5:1, John 14:27, John 16:33)
Romans 5:1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
John 14:27 Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid.
John 16:33 These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.