John 20, Verse 21
[Jesus] said to them again, “Peace be with you. As the Father has sent me, so I send you.”
Christ then breathed on them and said, “Receive the Holy Spirit. If you forgive the sins of any, they are forgiven them.” This is the peace of Christ. This is the renewal of man. Just as God the father breathed the breath of life in Adam now Christ breathes the breath of life in his church via the apostles and to all mankind through the sacrament of confession. This is why the Sanhedrin killed Christ because He forgave sins; seek his face; seek his peace through this sacrament.
In fact the angels plead the cause of humans against the devils, by offering the precious Blood of Jesus. This ministry is especially exercised by the Seraphim, Cherubim and the Thrones as they are nearest to God in the celestial realm. In addition to the angels seeking to gain the peace of Christ in our behalf; we also have His mother Mary whom the angels welcomed into heaven at her assumption who pleads our cause. We can be at peace upon our death knowing that it is she that will welcome us saying, “My Son calls thee.” We can only be at peace when we know we can never find true contentment here, because no earthly object or goods can meet the yearnings of the human heart. Only the vision of God, the Infinite Good, can bring peace.