One theory is that Moses' in-laws were blacksmiths and taught him how to tend the sacred fires. It shall be a statute for ever unto their generations on the behalf of the children of Israel. Then there is the story of Elijah who, in contending with the priests of Baal, held a fire building contest. In Jewish temples, to this day, the eternal flame continues to burn. The Lord is my light and my salvation.
Light is the symbol of the divine in humanity.
The spirit of humanity is the light of the Lord. Light is the symbol of Israel's mission. I the Lord have set thee for a covenant of the people, for a light unto the nations. In ancient times, the ability of a priest or prophet to make fire, or to control fire, was a testimony of his or her approval by God. Fire-making, among many peoples, was the ultimate test of the religious leader.