Jesus discusses hell with his disciples to correct their misconceptions about His kingdom and illustrate the importance of faith alone for salvation.
In the context of Mark 9, Jesus instructs his disciples about hell to redirect their understanding from an earthly, hierarchical perspective of His kingdom to a spiritual one focused on faith. The disciples were focused on positions of power and greatness in this world, and Jesus sought to emphasize that true greatness in His kingdom is found in humility and faith. By teaching them about hell's horrors, He highlights the necessity of faith in Christ as the distinguishing factor that separates the righteous from the wicked. This understanding reshapes their mission and the gravity of their calling to preach the Gospel.
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