"I don't mean to be flip with this, but like I wrote (maybe not to you) a few days ago, I have not studied St. Anselm's theology in sufficient depth in order to discuss it. Regarding the Eucharist as sacrifice, it is one and only, perfect sacrifice of Christ. We do not re-sacrifice, but we bring ourselves to that one sacrifice through the Mass. Our purpose therefore is the same as Christ's purpose, so whether God "demanded" the sacrifice as you insist (there are verses to the contrary, as you are aware), or Christ offered it as an expression of His love to us, -- as is the proper answer, -- the fact that we participate int he Eucharist is neither here or there in that."
That's thoroughly Orthodox, Blogger. In all honesty, if you want a primer in the Eucharist theology of The Church, read the letters of +Ignatius of Antioch. Its all there.
I do not believe that there are verses to the contrary for I see no conflict in the fact that God's justice demanded the sacrifice IF God were to be reconciled to Man and Jesus willingly laying down His life on the cross. Both aspects are in harmony with God's will of being reconciled with man. Both respect His justice. If God had saved everyone without any punishment for sin, his justice would have been violated. God can not go against His own nature. I don't think His willingly laying down His life and His justice demanding the sacrifice are opposing ideas.