How do we know that dependence on Christ is essential for Christians?

In John 15:5, Jesus asserts, 'Without me you can do nothing,' highlighting the necessity of reliance on Him for spiritual fruitfulness. This dependency is central to the Christian walk, as believers draw sustenance, strength, and guidance through their relationship with Christ. In every aspect of life, from enduring trials to serving others, Christians must rely on Christ's power and grace to navigate their journey faithfully. This dependence ensures that their achievements reflect God's work in their lives, not their own efforts.