We commemorate the Dedication of the Basilicas of St. Peter and St. Paul because the Church wants us to remember the importance of consecrated places in which the worship of God takes place. It reminds us of the importance of the consecration of every Catholic Church throughout the world. It is a reminder to us of the incarnational principle on which our faith is based – that God extends His spiritual blessings to us through the use of physical things. He took human flesh upon Himself. He has instituted seven sacraments which use outward forms to communicate inward grace. He has established a hierarchical Church, with a physical presence in the world, to be a sign of His own presence with us.
Defend thy Church, O Lord, by the protection of the holy Apostles: that, as she received from them the beginnings of her knowledge of things divine; so through them she may receive, even to the end of the world, an increase in heavenly grace; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Spirit, ever one God, world without end. Amen.