Seeing is believing. Mary Magdalene saw Jesus on Easter morning, and she believed, and then she told the rest of the disciples “I have seen the Lord.” Later that evening, Jesus appeared to the disciples who had locked themselves in out of fear of the authorities. He came to them in the darkness of night, which in the Gospel John serves as a symbol for unbelief. At the beginning of his Gospel, John declares that the Word of God “was the light of all people. The light shines in the darkness, and the darkness did not overcome it” (Jn. 1:4-5). Jesus came to them that evening as light shining into their darkness of unbelief.
Mary prepared them for what came next, but I’m not sure they were completely ready when Jesus suddenly appeared in the room. He said to them: “Peace be with you,” and then he showed them the wounds in his hands and side. Then the disciples “rejoiced when they saw the Lord,” moving them from darkness into the light. But that’s not the end of the story, because Jesus gives them a commission. He told them: “As the Father has sent me, so I send you.” Then he breathed on the disciples and said: “Receive the Holy Spirit.”