Read the text and answer the following question. is this lesson saying that i never get to express my opinion in writing? when writing exposition it does. take a controversial theory like evolution. in an expository essay, you would avoid including any personal opinion or position on the matter. your goal would be to let the reader know about the theory of evolution as a concept or idea. any personal opinion, regarding whether you agree or disagree with the theory, would have to be left to a different form of writing: persuasion. what is the main idea in the text? - the theory of evolution is a controversial idea. - opinions should be left out of expository text. - you can never put your opinions in writing.