Why is the concept of spiritual life important for Christians?

The concept of spiritual life is crucial for Christians because it is only through spiritual life that one can truly hear and believe the gospel message. In John 6:63, Jesus explains, 'It is the spirit that quickeneth; the flesh profiteth nothing.' This reveals that without the work of the Holy Spirit in giving life, individuals remain spiritually dead and unable to respond to the truth of Christ. Embracing this truth affects one's understanding of faith, showing that genuine belief is rooted in being made alive by the Spirit, which brings about true transformation and salvation.