New Defender's Study Bible Notes
9:48 worm dieth not. Jesus spoke often warning of hell, with this entire passage (Mark 9:42-50) being a prime example. The undying worm indicates never-ending disintegration and the unquenchable fire indicates eternal suffering, however they may be implemented. The contemplation of such a future ought to drive men to “flee from the wrath to come” (Matthew 3:7), but instead it often impels them to even more adamant unbelief. Nevertheless, like it or not, it was their very Creator who was here issuing the warning.