“He that is strongly of any opinion must suppose (unless he be self-condemned) that his persuasion is built on good grounds, and that his assent is no greater than what the evidence of the truth he holds forces him to, and that they are arguments and not inclination or fancy that make him so positive in his tenets. Now, if after all his profession he cannot bear any opposition to his opinion, if he cannot so much as give a patient hearing, much less examine and weigh the arguments on the other side, does he not plainly confess it is prejudice governs him?”

John Locke