As to the argument that it is true opinion and not knowledge against which men act incontinently, it really makes no difference here; for some of those who merely have opinions are in no doubt at all, but fancy that they have exact knowledge.

If then it be said that those who have opinion more readily act against their judgment because of the weakness of their belief, we would answer that there is no such difference between knowledge and opinion; for some people have just as strong a belief in their mere opinions as others have in what they really know, of which Heraclitus is an instance. 176