Note 211

And only then we predicate something of an unum (we predicate an unum of an unum), for example  ' whiteness [ = unum] is a color [ = unum] '.  (white is concrete, because it means white thing), while whiteness is abstract :  a thing can have whiteness.  Also :  colored is concrete, because it means colored thing, while color is abstract :  a thing can have color ).

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