This is an author's intention, reason, or drive for writing the piece.
Logos
A speech or piece of writing praising something is called a eulogy or tribute. It is a formal expression of admiration, reverence, or appreciation for someone or something.
Logos
Logos
Logos
purpose
At the end of a piece of writing.
The part of speech for "authors" is a noun, while "purpose" is a noun as well. Together, "authors purpose" is a noun phrase used to refer to an author's intent or reason for writing a piece of work.
"Central idea" is a noun phrase. It refers to the main point or topic of a piece of writing, speech, artwork, etc.
propostition
proposition