The Relationship of the Cross and the Mass
Through Your Word, save a soul, forgetting not my own
To understand the relationship between the cross and the Mass, we must understand Christianity. Christianity, as Fulton Sheen has explained, is not man making a quest for God, but God making a quest for man. This was made explicit when Our Blessed Lord became flesh. Many have lost the significance of the Incarnation. Fulton Sheen gave the best explanation:
"Suppose you were saddened by the way dogs were treated, beaten by strangers, starved, and driven from the company of men. To teach mankind to love dogs, further suppose that you divested your body and put your soul into the body of a dog. That would mean that inside the organism of a dog was an intellect capable of knowing God and a will capable of loving Him. Suppose that when you took on the form and habit of a dog, you resolved never to transcend the limitations of that animal organism. Though you had a mind that could scan the finite, you would never speak, you would not utter a word but would limit yourself to a bark. Though you were an artist, you would not use a brush to create. Second, suppose you resolved to subject yourself only to the companionship of other dogs, sharing their lives just in an effort to try and help them in virtue of your superior mind. That would indeed be an act of humility and a humiliation, particularly if you died defending the animals whose nature you embraced in order to save." 
This was the kind of humility Our Blessed Lord had to go through. One must always note the significance of what Our Blessed Lord has done, especially at Mass. Think of the humility Our Blessed Lord had to go through so that we may partake the sacrifice of the Cross. In order for us to partake of the cross, He would have to become present in a form of bread and wine. The question then would arise, how could the Mass be the same sacrifice as the cross without re-sacrificing Jesus?
To answer this question, we must remember that God is always making a quest for man and we must know the importance of a sacrifice. An animal sacrifice in the Old Testament meant many things: recognition of God’s sovereignty over creation -- man acknowledged this fact by giving back to God what is ultimately His. Thus, sacrifice praised God from Whom all blessings flow. An act of thanks served as a way of solemnly sealing an agreement or oath, a covenant before God (Gen 21:22-32). The person offering sacrifice recognized that his sins deserved death; he offered the animal’s life in place of his own. 
The sacrifice of the cross means all four of these. It made recognition of God’s sovereignty over creation by showing that God conquers all things including death. This is also an important point: that the cross and the resurrection cannot be separated for if there is no cross, there would be no resurrection, and if there is no resurrection, then the cross is meaningless. The cross and the resurrection are progressive and affect us now. The cross would then affect us by the
The reason why there is the Mass is because the cross must be applied to us. Catholic theologian Dr. Ludwig Ott wrote:
"While the Sacrifice on the Cross is an absolute sacrifice, as it is neither the commemoration of a past sacrifice nor the archetype of a future sacrifice, the Sacrifice of the Mass is a relative sacrifice, as it is essentially linked to the Sacrifice on the Cross. The Council of Trent teaches: Christ left a visible Sacrifice to His Church: in which that bloody sacrifice which was once offered on the Cross should be made present, its memory preserved to the end of the world, and its salvation-bringing power applied to the forgiveness of the sins which are daily committed by us." 
The Mass then, is the sacrifice of the Mystical Body of Christ, and is one with
"Suppose I took a black marker and made one dot on a rubber band. That one dot would be present at one point on that rubber band. Suppose, now, that I stretched that rubber band. What would happen to that one dot? It would be the same one dot but it would now become present at various points on the rubber band. The same holds true with the sacrifice of the
The Cross was in
"In effect, Christ does in a perfect way what Moses did in an imperfect way, appealing to God on our behalf. In His act, He brings to God, moment by moment, the memory of His once-for-all supreme sacrifice on the Cross and seeks to propitiate God’s wrath against sin…The continuity and perpetuity of the appeasement is enacted by the re-presentation of the Cross to the Father by the sacrifice of the Mass, and carried to heaven in His sight. God is affected by the sacrifice of the Mass because God is personal. He can accept it because He, although infinite, exists in and has committed Himself to a moment by moment relationship with His creatures." 
It is worth quoting Sheen at length:
"They might have done two things with His death which would have fallen so short of the Way of Divinity. They might have regarded His redemptive death as a drama presented once in history like the assassination of
Take away the Mass, and you take away Christianity. Take away the Mass, and Christianity would be the same as other world religions, trying to reach God. But Christianity is God reaching for our hearts. Take away the Mass, and we would never get the fruit of the Cross, which is the Resurrection. It is the Mass that makes the Church one. Like the Physical Body of Christ, the Church, which is the Mystical Body of Christ, has her wounds, scars, and bruises by her scandals, disloyalties, and moral bruises, but not one bone would be broken because the Mass keeps her inner structure in place.
If I were looking for the Church that Christ founded, I would look for the Church that commemorates what was done at the Last Supper. If one were looking for evidence of the resurrection, one must go inside the Church that commemorates this event. It is no coincidence that after 2,000 years the Church would be commemorating something if it were just a symbol. It’s more than a symbol. It’s the Cross applied to us.
 Life is Worth Living, page 44;  Scott Hahn’s The Lamb’s Supper, page 19;  Fundamentals of Catholic Dogma by Ludwig Ott, page 407;  In the Fullness of Time by Fulton Sheen, page 83;  Ott, page 274;  Unabridged Christianity: Biblical Answers to Common Questions About the Roman Catholic Faith, page 113-114;  Fullness, page 84;  Life of Christ, page 141; Fullness, page 87;  Not by Bread Alone, page 396;  Life of Christ, page 280-281.