Expounding on the meaning behind the terms such as "fiery furnace," "Gehenna of fire," "outer darkness," as well as "weeping and gnashing of teeth," Jesus Christ conveyed to His audience the fate awaiting sinners. He stated that those condemned at the end of the age would be thrown into the fiery furnace, a place of weeping and gnashing of teeth. The question arises: should we interpret "fiery furnace" literally, or is it a metaphor for the torment reserved for sinners? This phrase might only be taken literally if Jesus consistently spoke of the future awaiting sinners in this manner; however, it is noted that at other times, He used different expressions. For instance, in the Sermon on the Mount, He described the suffering of sinners akin to that of a place in the valley of Gehenna (Matthew 5:29). Later, when discussing the fate of the Jews, He mentioned their casting into outer darkness, where there will be weeping and gnashing of teeth, while many will come from the east and west and recline with Abraham, Isaac, and Jacob in the kingdom of heaven (Matthew 8:11-12).
The concept of burning was familiar to Jesus' audience through the Old Testament. Judah, Jacob's son, sentenced his daughter-in-law Tamar to be burned (Genesis 38:24); David subjected the defeated inhabitants of Rabbah to fire (2 Samuel 12:31); Nebuchadnezzar ordered Ananias, Mishael, and Azariah to be cast into the fiery furnace for their refusal to worship the golden image (Daniel 3:21). Generally, burning at the stake was a prevalent and horrific method of execution in Eastern cultures, recognized as one of the most agonizing forms of capital punishment. Thus, when Jesus spoke about the dire consequences awaiting sinners in eternal life, He used the image of the fiery furnace to vividly illustrate their potential fate if they did not turn from their ways and embrace a new life.
Furthermore, in responding to the Sadducees regarding the resurrection, Jesus compared those who would rise to spirits or angels at the Last Judgment, clarifying that the resurrected bodies would differ from our current physical forms (Luke 20:27-36). This leads us to conclude that the sufferings of the condemned will be more psychological than physical in nature.