No. 1408 and 1409, page 356 of the Catechism of the Catholic Church, Libreria Editrice Vaticana: Urbi Et Orbi Communications:
Because Christ Himself is present in the sacrament of the altar, He is to be honored with the worship of adoration. "To visit the Blessed Sacrament is "a proof of gratitude, an expression of love, and a duty of adoration toward Christ our Lord" (Paul VI, Mysterium Fidei66)
Having passed from this world to the Father, Christ gives us in the Eucharist the pledge of glory with him. Participation in the Holy Sacrifice identifies us with his Heart, sustains our strength along the pilgrimage of this life, makes us long for eternal life, and unites us even now to the Church in Heaven, the Blessed Virgin Mary, and all the saints.
From the Baltimore Catechism No. 3; Benziger Brothers, Inc. and Tan Books and Publishers, Inc. No. 922 and 923, page 197
Q. What were the ends for which the sacrifice of the Cross was offered?
A. The ends for which the sacrifice of the Cross was offered were: 1st, to honor and glorify God; 2nd, to thank Him for all the graces bestowed on the whole world; 3rd, to satisfy God's justice for the sins of men; 4th to obtain all graces and blessings.
Q. How are the fruits of the Mass distributed?
A. The fruits of the Mass are distributed thus: The first benefit is bestowed on the priest who says the Mass; the second on the person for whom the Mass is said, or for the intention for which it is said; the third on those who are present at the Mass, and particularly on those who serve it, and the fourth on all the faithful who are in communion with the Church.