Christ gave His priests the power to change bread and wine into His body and blood when He made the Apostles priests at the Last Supper by saying to them: “Do this in remembrance of Me.”
Thus He commanded them and their successors to renew till the end of time what He had just performed. This change of bread and wine into the body and blood of Christ continues to be made in the Church of Jesus Christ, through His priests.
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In the Holy Eucharist Our Lord is present whole and entire, Body, Blood, Soul and Divinity. When the Blessed Sacrament is reserved in the tabernacle (5), a sanctuary lamp (6) is kept burning before it.