Finite man sinned against an infinite God. Finite man could not restore right relationship with an infinite God by his own doing. Simply put, no amount of finite could ever add up to infinite.
The Old Testament sacrifices, while efficacious to a degree, fell short in its ability to restore right relationship with God. The OT sacrifices were offered by a finite priest, with a finite victim resulting in a finite sacrifice. What was needed for finite man to restore right relationship with an infinite God, was an infinite priest, who could offer an infinite victim resulting in an infinite sacrifice.
But how is that possible. How could a finite man be an infinite priest and where would finite man find an infinite victim to offer as an infinite sacrifice?
And the word became flesh and dwelt among us.
Suddenly, with the incarnation we have an infinite man who would, in time, become an infinite priest, an infinite victim and an infinite sacrifice, but who was also a “finite” man. Fully human and fully divine, Jesus Christ, and only Jesus Christ, was able to restore right relationship with God. Fully human, He was (is) one of us. Fully divine, He was (is) one with God. He is an infinite priest, who is eternally offering up Himself as an infinite victim, in an infinite sacrifice all the while being fully human.
That is why each Mass is not a symbolic representation or a memorial meal, but is actually that same “once for all” sacrifice that took place 2000 years ago on Calvary. That infinite moment that took place in the eternal now is made present again in the time bound now at each and every celebration of the Eucharist.
Jesus Christ, fully God and fully man, is present to us Body, Blood, Soul and Divinity and each and every Mass. For that we should be eternally grateful.