St Padre Pio, the stigmatic priest, said, the world could exist more easily without the sun than without the Mass.
The Cure' d' Ars, St. Jean Vianney said, if we knew the value of the Mass we would die of joy.
A great doctor of the Church, St. Anselm, declares that a single Mass offered for oneself during life may be worth more than a thousand celebrated for the same intention after death. St. Leonard of Port Maurice supports this statement by saying that one Mass before death may be more profitable than many after it.
"The Holy Mass would be of greater profit if people had it offered in their lifetime, rather than having it celebrated for the relief of their souls after death." (Pope Benedict XV).
Once, St. Teresa was overwhelmed with God's Goodness and asked Our Lord, "How can I thank you?" Our Lord replied, "ATTEND ONE MASS."
The Blessed Virgin Mary once told Her faithful servant Alain: "My Son so loves those who assist at the Holy Sacrifice of the Mass that, if it were necessary He would die for them as many times as they've heard Masses." (Page 107, last paragraph of "Explication Du Saint Sacrifice De La Messe" parle R.P. Martin de Cochem Friere - Mineur Capucin.)
"Jesus, Mary, I Love You, Save Souls"
For more information see: A Primer on the Holy Sacrifice of the Mass