St. John Vianney
“The Holy Mass consists of the words of Consecration. How wonderful it is! After the Consecration the good God is there as He is in heaven. If men really knew this mystery they would die of love. God has to spare us because of our weakness. The Holy Sacrifice is the same as that which was offered once on Calvary on Good Friday. The only difference is that when Jesus Christ was offered on Calvary, the Sacrifice was visible. That is to say, one saw with one’s bodily eyes that Jesus Christ was offered there to God His Father by the hands of His executioners, and that He shed His Blood; that is to say that the Blood flowed from His veins and one saw it flow on the earth. But in the Mass Jesus Christ offers Himself to His Father in an invisible and unbloody manner.”
Source: St. John Vianney, The Meditations of the Curé D’Ars