A lake of fire is read as consuming guilt or punishment you fear, often inherited from strict teachings. Dream books also see fire as purification — what burns away leaves something purer behind.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.