If a judgment is valid for everyone, its ground is objectively sufficient and the holding of it is entitled conviction . If the ground of a judgment lies in the special character of the subject, it is entitled persuasion .
Persuasion is mere illusion.
Truth depends on agreement with the object. The judgments of every understanding must be in agreement with each other. The touchstone whereby we decide whether holding a thing to be true is conviction or persuasion is external. It must be possible to communicate it and find it valid for all human reason. There is at least a presumption that the ground of the agreement of all judgments with each other rests upon the object, which proves the truth of the judgment.