Full Idea
I will not willingly use apparatus that peoples the world with a host of ethereal, platonic, pseudo entities.
Gist of Idea
Classes are a host of ethereal, platonic, pseudo entities
Source
Nelson Goodman (The Structure of Appearance [1951], II.2), quoted by David Lewis - Parts of Classes 2.1
Book Reference
Lewis,David: 'Parts of Classes' [Blackwell 1991], p.34
A Reaction
This represents the big gap that opened up with Goodman's former comrade in arms, Quine. Lewis quotes it in order to ask whether he means ethereal or platonic, as they are very different. I sympathise with Goodman.