The Bible often times uses fire as a symbol of God’s work in us. Jeremiah was called to preach, and he didn’t want to. He said, “I said to myself, ‘I will not proclaim the word of God.’ But God’s word was like a fire inside my bones and I had to preach.” God’s word in you can be like a fire. It has to come out. If God’s word is in you, you must tell people about it, and you must pass it on by preaching and teaching and witnessing.
The Holy Spirit is like a fire. Remember when the Holy Spirit came on the Day of Pentecost? There were three symbols used to describe his coming. He came as a rushing mighty wind, and then he appeared as cloven tongues, and then it says, “They were like unto fire.”