What is the word for digressing from a topic to talk passionately about something?
Basically when someone jumps to a kind of related topic and talks about it very passionately for a while. What is the word for that?
As in, "I hate to go on a -------- but I want to tell the group about how the themes in this book relate to modern topics."
Not tangent or digress.
You are making an aside:
a remark or story in a speech or text that is not part of the main subject.
(Cambridge Dictionary)
the content of the aside would be a panegyric
a eulogistic oration or writing
(M-W)