Catechism of the Catholic Church
647 O truly blessed Night, sings the Exsultet of the Easter Vigil, which alone deserved to know the time and the hour when Christ rose from the realm of the dead! 512 But no one was an eyewitness to Christ's Resurrection and no evangelist describes it. No one can say how it came about physically. Still less was its innermost essence, his passing over to another life, perceptible to the senses. Although the Resurrection was an historical event that could be verified by the sign of the empty tomb and by the reality of the apostles' encounters with the risen Christ, still it remains at the very heart of the mystery of faith as something that transcends and surpasses history. This is why the risen Christ does not reveal himself to the world, but to his disciples, "to those who came up with him from Galilee to Jerusalem, who are now his witnesses to the people." 513
English Translation of the Cathechism of the Catholic Church for the United States of America © 1997, United States Catholic Conference, Inc.