Mass as the Source:
Mass is the place where we draw all our strength, from the perfect sacrifice of Christ (which was made present on the altar & received in Holy Communion), so as to glorify God and serve Him through everything we do and experience (prayers, works, joys, sorrows and sufferings).
Mass as the Summit:
The Holy Mass is the place where we bring everything back to God (our prayers, works, joys, sorrows and suffering) and offer them to Jesus so that he can unite them with his perfect sacrifice and offer it to the Father, for the salvation of the world.
The Holy Mother Church teaches us that the Mass (and the Eucharist) is the “Source & Summit” of our lives. As the source – It’s the place where we draw all our strength from so as to glorify God and serve Him through our prayers, works, joys, sorrows & sufferings.
As the summit – Is where, each time we go, we bring everything (prayers, works, joys, sorrows & sufferings) back to God & in a spiritual way place them on the altar, with the gifts of bread & wine, so that God can unite it with the offering of Christ and give it an eternal value.
In a great way, this increases the value of everything we offer to Him because each one is now filled with the presence of Christ and has become a channel of his grace.