We often say these words in church as a rote greeting or part of the liturgy, sometimes without really thinking about them or what they mean.
"Peace be with you." Jesus said this when He appeared to the disciples after the resurrection, at a time when they needed all the peace and comfort they could get. They were probably also freaking out since He was, after all, dead, yet standing before them. "Peace be with you," He said, and then He charged them to share that peace with the world.
As we celebrate Easter today, please remember His blessing in its fullest meaning and not just as rote phrasing. By His death and resurrection, He blessed us all with a peace that passes understanding.
Peace be with you.