Col 1:19-20 NKJV For it pleased the Father that in Him all the fullness should dwell, (20) and by Him to reconcile all things to Himself, by Him, whether things on earth or things in heaven, having made peace through the blood of His cross.
I think that we can learn a lot about what God has done through Jesus Christ by understanding the meaning that God had given the Hebrews for the word Shalom. Peace is far more then an end of hostility and what we normally think of when we hear or say peace. The Strong's definition of Shalom should shed some light on the subject. Here is the definition as it is in the Strong's Lexicon,
H7965 shâlôm shâlôm shaw-lome', shaw-lome' From H7999; safe, that is, (figuratively) well, happy, friendly; also (abstractly) welfare, that is, health, prosperity, peace: - X do, familiar, X fare, favour, + friend, X greet, (good) health, (X perfect, such as be at) peace (-able, -ably), prosper (-ity, -ous), rest, safe (-ly), salute, welfare, (X all is, be) well, X wholly.