Full Idea
Existence can only be asserted of something described, not of something named.
Gist of Idea
Existence can only be asserted of something described, not of something named
Source
Bertrand Russell (Introduction to Mathematical Philosophy [1919], XVIII)
Book Reference
Russell,Bertrand: 'Introduction to Mathematical Philosophy' [George Allen and Unwin 1975], p.203
A Reaction
This is the motivation behind Russell's theory of definite descriptions, and epitomises the approach to ontology through language. Sounds wrong to me!