How do we know the spiritual man is different from the natural man?

The distinction between the natural man and the spiritual man lies in the new birth. The spiritual man is described as one who possesses the Holy Spirit, having been born of the Spirit (John 3:6). 1 Corinthians 2:15 states, 'But he that is spiritual judgeth all things.' This means that the spiritual man has the ability to discern spiritual matters, as he has a new heart and mind that align with God’s nature. Unlike the natural man, who cannot perceive the things of God, the spiritual man understands the depths of the gospel and recognizes the significance of Christ's work. Romans 8:9 notes that if anyone does not have the Spirit of Christ, he does not belong to Him, emphasizing that belonging to Christ is essential for true understanding.