The very building is a symbol of what the Church is. Throughout the Christian centuries, the motive for the thought and labor and sacrifice that have gone into the building of churches has been to make the house of God a place worthy of His dwelling. The Apostle Paul could tell his people:

You are his building. You form a building which
rises upon the foundation of the apostles and prophets,
with Christ Jesus himself as the capstone. Through
Him the whole structure is fitted together and takes
shape as a temple of the Lord.

The entire structure of any building rests upon the strength of its foundation, with each part of the building supporting, and being supported by, every other part. With each member considered as a living stone, the entire community of believers "is built as an edifice of spirit," resting firmly upon Jesus Christ, "an approved stone," who is of "value to you who have faith."
- Paulist National Catholic Evangelization Assn.