The peace of God that guards our hearts and minds comes through Jesus (Philippians 4:7). He is the Prince of Peace (Isaiah 9:6). So a prayer for peace is a prayer for Jesus.
In John 20, after Jesus had appeared to Mary Magdalene, the disciples were gathered together on the first day of the week. They were inside with the door locked, scared of the Jews. They didn’t know what to do. Jesus showed up and declared, “Peace be with you!” (verse 19, and again in verse 26, see also Psalm 122:8).
Walls and locked doors could not keep Him out. Nothing could stop Him from revealing Himself to them, including their fears and the grave. He was doing exactly what He taught His disciples to do in going out to proclaim peace to each house they enter (Luke 10:5).
Today, as we gather together in our homes to worship the Prince of Peace and remember who He is, we invite that peace in to each house we enter. He is the fulfillment of God’s blessing to Israel in Numbers 6:26. He gives us peace by giving us His Son.
So when we bring peace, we must believe and not doubt. We have Jesus dwelling within us (Romans 8:10, 2nd Corinthians 13:5, Galatians 2:20, Ephesians 3:17, Colossians 1:27). Death has no power over those who put their trust in Him (Revelation 20:6).