Full Idea
If 'existence' is understood so that it can be a substantive thesis that only some of the things there are exist, we will have none of it.
Gist of Idea
We can't accept a use of 'existence' that says only some of the things there are actually exist
Source
David Lewis (Noneism or Allism? [1990], p.163)
Book Reference
Lewis,David: 'Papers in Metaphysics and Epistemology' [CUP 1999], p.163
A Reaction
Lewis is a strong advocate, following Quine, of the univocal sense of the word 'exist', and I agree with them.