On the night before His death, at the Last Supper, Jesus told His Apostles that He had to go away. He promised them that He would not leave them as orphans, but that He would leave them a Comforter, the Holy Spirit, to be with them. They were concerned by the thought of Him leaving, and likely puzzled by the mention of the Spirit. They would soon learn the important role that the Holy Spirit would have in the Church and in their lives.