The Mass of the Ages is heaven come to Earth.  The Mass is the highest form of prayer, the greatest act of worship that can be offered to God, and an infinite source of graces for the living and the dead.  On the altar at Mass is the very same sacrifice as occurred on Calvary.  More than just a remembrance or memorial, the Mass actually renews, with the separate consecration of the bread and wine, the death of Our Lord, and the separation of His Body and Blood.

1 Corinthians 11:26 For as often as you shall eat this bread, and drink the chalice, you shall shew the death of the Lord, until he come.

Cardinal Francis Arinze explains that there are four purposes for attending Mass: adoration, contrition, thanksgiving, supplication.