Google led me to "thedivinemercy.org" and I was reading up on this.
One link led to the Pope's speech, and I liked this part:
"This renewal of the world can be summed up in a word: the same word that the Risen Jesus pronounced as a greeting, and much more as an announcement of His victory to His disciples: "Peace be with you!" (Lk 24:36; Jn 20:19,21,26). Peace is the gift that Jesus left to His friends (cf. Jn 2:27) as a benediction that was destined for all people and all nations.
It is not a peace according to the mentality of the "world," as a balance of power, but it is a new reality, fruit of the love of God, of His mercy. It is the peace that Jesus Christ earned at the price of His blood and that He communicates to those who trust in Him. "Jesus, I trust in You": In these words the faith of the Christian is summed up, a faith in the omnipotence of the merciful love of God."
Peace with God and with others is a gift from God, that we can receive by putting our trust in Christ.