“On the Lord's own day, assemble in common to break bread and offer thanks;  but first confess your sins, so that your sacrifice may be pure. However, no one quarreling with his brother may join you. On the Lord's own day, assemble in common to break bread and offer thanks; but first confess your sins, so that your sacrifice may be pure. However, no one quarreling with his brother may join your meeting until they are reconciled; your sacrifice must not be defiled. For here we have the saying of the Lord: In every place and time offer me a pure sacrifice; for I am a mighty King, says the Lord; and my name spreads terror among the nations. [Mal 1:11,14]."
 
  ~~ From the Teachings of the Twelve Apostles, 90 A.D.
 
Libraries and websites are dedicated to the centrality of The Eucharist.  Saint Augustine may have said it best:  "Become what you eat, The Body of Christ."  At Mass we not only remember the life-giving sacrifice of Christ, but we make it present today and carry His redeeming grace with us to wherever we go.  The ancient practice of frequent reception of this sacrament is the preeminent path to holiness for Catholic and Orthodox Christians, because we do not believe in a symbolic representation of Christ in the bread and wine of The Eucharist, but in His "Real Presence."