"Fire" is a symbol of the reproving, spiritually purifying Word of God's Will, His Covenants, Commandments, addressed to the conscience and mind of man.
"Fire" is the Word of Truth of God's Laws, "burning" the sinful impurity of man, following God's Commandments and bringing him to a morally and spiritually pure state.
"Fire" is the Word of God's Will, proclaimed by the Righteous to the nations to destroy their sinful worldview and lifestyle, and to convert them to the fulfillment of God's Will.
Negative Meaning.
"Fire" is a symbol of the devastating, tragic, agonizing consequences of man's neglect, ignoring the voice of conscience and his rejection, violation, perversion of God's established Commandments.