Full Idea
Applying the operator '-ness' or 'class of' to abstract general terms, we get second-level abstract singular terms.
Gist of Idea
Apply '-ness' or 'class of' to abstract general terms, to get second-level abstract singular terms
Source
Willard Quine (Identity, Ostension, and Hypostasis [1950], 5)
Book Reference
Quine,Willard: 'From a Logical Point of View' [Harper and Row 1963], p.78
A Reaction
This is the derivation of abstract concepts by naming classes, rather than by deriving equivalence classes. Any theory which doesn't allow multi-level abstraction is self-evidently hopeless. Quine says Frege and Russell get numbers this way.