Discourse

noun
an extended communication (often interactive) dealing with some particular topic
“the book contains an excellent discussion of modal logic”
Similar: discussion, treatment
noun
an address of a religious nature (usually delivered during a church service)
Similar: sermon, preaching
noun
extended verbal expression in speech or writing
verb
to consider or examine in speech or writing
“The author talks about the different aspects of this question”
Similar: talk about, discuss