On the other hand, an accidental predicate is the hardest thing to overthrow, because it affords the least material; for in stating an accident a man does not add how the predicate belongs; and accordingly, while in other cases it is possible to demolish what is said in two ways, by proving either that the predicate does not belong, or that it does not belong in the particular way stated, in the case of an accidental predicate the only way to demolish it is to prove that it does not belong at all.