Capitulum

Ephesians 2:20 presents the Church's architectural metaphor: believers are 'superaedificati' (built upon) the foundation of Apostles and Prophets. Christ is 'summus angularis lapis' - not merely a cornerstone but the keystone that holds the entire structure together. Read at Sext (the sixth hour of Christ's crucifixion), this text connects apostolic foundation to the Cross where the Church was born from Christ's side. Every Christian's faith rests upon the testimony of the Apostles who witnessed the crucified and risen Lord.