Tradition
St. Cyril of Jerusalem
Catechetical Lectures
Book 18 › Introduction
On the Words, And in One Holy Catholic Church, and in the Resurrection of the Flesh, and the Life Everlasting.
Ezekiel 37:1
The hand of the Lord was upon me, and carried me out in the Spirit of the Lord, and set me down in the midst of the valley which was full of bones.
Source: Catechetical Lectures (New Advent)