Because the church is a visible building, it stands as a special sign of the pilgrim Church on earth and reflects the Church dwelling in heaven.
When a church is erected as a building destined solely and permanently for assembling the people of God and for carrying out sacred functions, it is fitting that it be dedicated to God with a solemn rite in accordance with the ancient custom of the Church.
A church should be "dignified, evincing a noble beauty...and stand as a sign and symbol of heavenly realities."
Rite of Dedication of a Church
Chapter 2, Introduction