Neque opinione sed natura constitutum est jus=--Not in opinion, but in nature is law founded.
I should much like to see an Italian work, of which I know the title only, but such a title is worth many books: Della opinione Regina del mondo.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "opinione" in a variety of sentences. We hope that you will now be able to make sentences using this word.