A sermon is a lesson delivered from above. Listening to one is read as receiving advice or judgement; giving one, as a need to share what you have come to believe.
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.