Why is union with Christ significant for Christians?

In John 15, Jesus elaborates on the metaphor of the vine and branches, teaching that spiritual fruitfulness is impossible without remaining in Him. He states, 'I am the vine; you are the branches.' This union is critical because it signifies an intimate relationship where believers draw spiritual nourishment from Christ. Through this union, Christians are enabled to bear fruit that glorifies God, as the life and power for living the Christian life flow from the vine. Therefore, the importance of this connection cannot be overstated; it is foundational for both obedience and spiritual growth.