The church is apostolic. Founded on the preaching in prayer of the apostles, on the authority that was entrusted to them by Christ himself. “You are no longer strangers and sojourners, your fellow citizens with the saints and members of the household of God, built upon the foundation of the apostles and prophets, Christ Jesus himself being a cornerstone” (Eph. 2:19 – 20); that is, he compares Christians to living stones that form and edifice that is the church, and this edifice is founded on the apostles, who are like columns, and the cornerstone that carries it all is Jesus himself. Without Jesus the church cannot exist! Jesus is the foundation of the church.
– Pope Francis, The Church of Mercy