I know that my Redeemer lives. I know this in two ways. The first way is that I encounter Him in the Eucharist. My experience of my thinking and feeling changes to peace when I encounter him in this way. The second is how St. Paul, whose reports of the Resurrection are more recent than the Gospel, describes the fact that people saw the Lord and that the Church is about the Resurrection, not some superior understanding of ethics (which sometimes it is not). A Resurrected Body of Christ is the Church, as well as the ascended Jesus. The whole Church, not the clergy. The Gospel accounts are later stories that flesh out the details, but they are not as important as the testimony of Paul.