The foundation is the most important structural element of a building. If the foundation is faulty, the rest of the building will be faulty as well. Jesus said that He would build His Church and the gates of Hades would not prevail against it (Matthew 16:18). Jesus could make this claim because the Church that Jesus builds is built on a firm, solid foundation: the foundation of the apostles and the prophets. If a church is built on any other foundation, it will be a faulty church.