Why the Traditional Latin Mass?

The Saints who came before Vatican II had this beautiful and mystical Mass. Saint Jean Vianney said “If we really understood the Mass, we would die of joy.” He also said: “When we receive Holy Communion, we experience something extraordinary – a joy, a fragrance, a wellbeing that thrills the whole body and causes it to exalt.” Saint Leonard of Port Maurice said: “I believe that were it not for the Holy Mass, as of this moment the world would be in the abyss.”; while Saint Francis of Assisi said: “Man should tremble, the world should quake, all Heaven should be deeply moved when the Son of God appears on the altar in the hands of the priest.” How can we let the Traditional Latin Mass go and how can it be replaced with something new when these saints who we follow and petition for help spoke so highly, deeply, and loving of the mystical Latin Mass?