An opinion is a belief that may or may not be backed up with evidence, but which cannot be proved with that evidence. An opinion is normally a subjective statement and may be the result of an emotion or an interpretation of facts; people may draw opposing opinions from the same facts.
In economics, philosophy, and other social sciences, analysis based on opinion is referred to as normative analysis (what ought to be), as opposed to positive analysis, which is based on scientific observation (what materially is or is experimentally demonstrable).
Historically, the distinction of demonstrated knowledge and opinion was articulated by Ancient Greek philosophers.

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Quotations
If all mankind minus one were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind. --John Stuart Mill, On Liberty (1859).

Encyclopedia
An opinion is a belief that may or may not be backed up with evidence, but which cannot be proved with that evidence. An opinion is normally a subjective statement and may be the result of an emotion or an interpretation of facts; people may draw opposing opinions from the same facts.
In economics, philosophy, and other social sciences, analysis based on opinion is referred to as normative analysis (what ought to be), as opposed to positive analysis, which is based on scientific observation (what materially is or is experimentally demonstrable).
Historically, the distinction of demonstrated knowledge and opinion was articulated by Ancient Greek philosophers. Plato's analogy of the divided line is a well-known illustration of the distinction between knowledge and opinion. Opinions can be persuasive, but only the facts they are based on can be said to be true or false.
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