On June 5, 1847...
Venerable John Henry Newman, C.O., celebrated his First Mass.

Our Lord not only offered Himself as a Sacrifice on the Cross, but He makes Himself a perpetual, a daily sacrifice, to the end of time. In the Holy Mass that One Sacrifice on the Cross once offered is renewed, continued, applied to our benefit. He seems to say, My Cross was raised up 1800 years ago, and only for a few hours—and very few of my servants were present there—but I intend to bring millions into my Church. For their sakes then I will perpetuate my Sacrifice, that each of them may be as though they had severally been present on Calvary. I will offer Myself up day by day to the Father, that every one of my followers may have the opportunity to offer his petitions to Him, sanctified and recommended by the all-meritorious virtue of my Passion. Thus I will be a Priest for ever, after the order of Melchisedech—My priests shall stand at the Altar—but not they, but I rather, will offer. I will not let them offer mere bread and wine, but I myself will be present upon the Altar instead, and I will offer up myself invisibly, while they perform the outward rite. And thus the Lamb that was slain once for all, though He is ascended on high, ever remains a victim from His miraculous presence in Holy Mass under the figure and appearance of mere earthly and visible symbols.

Venerable John Henry Newman, C.O., Meditations and Devotions