How do we know the doctrine of the Church being a vine is true?

The metaphor of the Church as a vine is firmly based in biblical texts, particularly in Psalms and the teachings of Jesus in the New Testament. The imagery of vines signifies growth and productivity, which echoes the biblical narrative of God’s covenant people being fruitful. Additionally, Jesus’ teaching in John 15 establishes His role as the true vine, further rooting this doctrine in Christian theology. By studying these passages, believers can affirm the truth of this doctrine, knowing that it illustrates God's ongoing work in the Church.