How do we know Jesus is the true vine?

In John 15:1, Jesus states, 'I am the true vine, and my Father is the husbandman', illustrating that He is the source of all spiritual life. As branches connected to this true vine, believers find their identity and sustenance. The imagery of vine and branches indicates the intimate union between Christ and His followers, emphasizing that apart from Him, they can do nothing. This understanding reinforces the doctrine of reliance on Christ for spiritual fruitfulness and the necessity of abiding in Him as the source of life and righteousness.