Suppose now that two philosophers, McX and I, differ over ontology. Suppose McX maintains there is something which I maintain there is not. McX can, quite consistently with his point of view, describe our difference of opinion by saying that I refuse to recognize certain entities. I should protest, of course, that he is wrong in his formulation of our disagreement, for I maintain that there are no entities, of the kind he alleges, for me to recognize; but my finding him wrong in his formulation of our disagreement in unimportant, for I am committed to considering him wrong in his ontology anyway.
When I try to formulate our difference of opinion, on the other hand, I seem to be in a predicament. I cannot admit that there are some things which McX countenances and I do not, for in admitting that there are such things I should be contradicting my own rejection of them.


W.V.O. Quine, From a Logical Point of View, New York, Harper and Row, 1963, p.1