How do we know that Jesus fulfills the role of the true vine?

The New Testament presents Jesus as the true vine as a direct response to Israel's historical failures. Jesus embodies the genuine fruitfulness that God seeks in His people. In Matthew 21:33-43, the parable of the vineyard underscores how God sent prophets to Israel, expecting fruit but finding none. When Jesus declares Himself as the true vine, He implies that where Israel failed to successfully live out God’s commandments and produce good fruit, He will succeed. Thus, by fulfilling the role of the true vine, Jesus acts as the source of life and nourishment for His followers, who are called to bear much fruit that glorifies God.