Quotes by Subject:

Opinion

Knowledge is true opinion. - Plato.

Opinion is the medium between knowledge and ignorance. - Plato.

People can tell you to keep your mouth shut, but that doesn't stop you from having your own opinion. – Anne Frank.

The opinions of men are almost as various as their faces. - Benjamin Franklin.

Whenever, therefore, people are deceived and form opinions wide of the truth, it is clear that the error has slid into their minds through the medium of certain resemblances to that truth. – Socrates.

Wind buffs up empty bladders; opinion, fools. – Socrates.