Christmas and Easter are both holidays of silence.
On both occasions, in the midst of deep darkness, light and power and life invaded. Once in the form of a baby, and once in the form of resurrection. Both were things people at the time didn't expect. Things they didn't understand. I am struck by the Matthew 28 passage, where his disciples went
Then the eleven disciples went to Galilee, to the mountain where Jesus had told them to go. When they saw him, they worshiped him; but some doubted. Even at this moment, with the risen saviour before them--they doubted.
At his birth, Mary "kept these things in her heart and pondered them." Most dismissed the things they didn't understand. But for the few who engaged and grappled with the mystery, it changed everything.