"This is the day the Lord has made; let us rejoice in it and be glad." (Ps 118:24)
The Celebration of the Eucharist, Mass, is the primary celebration of the central mysteries of our faith where we can regularly come together as the Body of Christ (community of Baptized) to hear the Word of God proclaimed, pray, and receive the Lord, Jesus Christ in the Eucharist.
In this celebration we "are to form one body, whether in hearing the word of God, or in taking part in the prayers and in the singing, or above all by the common offering of the Sacrifice and by participating together at the Lord’s table” (General Instruction of the Roman Missal (GIRM), 96).
Mass is celebrated daily, however Sunday, or the Lord's Day, is the day which the Scriptures tell us Christ rose from the dead (the day following the Jewish Sabbath) and the day where we fulfill Jesus' command to take his body and blood and "do this in remembrance of Me." - Luke 22:19
As “the first day of the week”(Mk 16:2) it recalls the first creation; and as the “eighth day,” which follows the Sabbath, it symbolizes the new creation ushered in by the Resurrection of Christ. Thus, it has become for Christians the first of all days and of all feasts. It is the day of the Lord in which He with his Passover fulfilled the spiritual truth of the Jewish Sabbath and proclaimed man’s eternal rest in God. (Compendium of the Catechism of the Catholic Church, no. 452)
Jesus’ Death and Resurrection opened for us the doors of salvation. Sharing in Jesus’death through our Baptism, we hope to share in his Resurrection, becoming a new creation in Christ. It is that new creation which we celebrate at every Mass.
“In the celebration of Mass the faithful form a holy people, a people of God’s own possession and a royal Priesthood, so that they may give thanks to God and offer the unblemished sacrificial Victim not only by means of the hands of the Priest but also together with him and so that they may learn to offer their very selves." (GIRM 95)
The Church has some beautiful writings about the Mass, like this one from the documents of the Second Vatican Council:
“At the Last Supper, on the night when he was betrayed, our Savior instituted the eucharistic sacrifice of his body and blood. He did this in order to perpetuate the sacrifice of the Cross throughout the centuries until he should come again and in this way to entrust to his beloved Bride, the Church, a memorial of his death and resurrection: a sacrament of love, a sign of unity, a bond of charity, a paschal banquet‘in which Christ is eaten, the heart is filled with grace, and a pledge of future glory is given to us” ”(Constitution on the Sacred Liturgy, #42).
If you are looking for more information on the Mass or are wanting to explore the our faith's central mysteries follow the link below: