vatican council ii: reforming liturgy (vatican ii book 2)  sacrosanctum concilium opened the door to all christians to understand the contemporary challenge to their life and health, and it started with the reform of the liturgy. in the words of paul vi the liturgy is the &apos;first source of life communicated to us, the first school of our spiritual life, the first gift we can give to christian people by our believing and praying, and the first invitation to the world.&apos; that is surely true for all of us.