Full Idea
An abstract object can be referred to only by means of a verbal phrase, ...and no confrontation with an abstract object is possible.
Gist of Idea
Abstract objects can never be confronted, and need verbal phrases for reference
Source
Michael Dummett (Frege Philosophy of Language (2nd ed) [1973], Ch.14)
Book Reference
Dummett,Michael: 'Frege Philosophy of Language' [Duckworth 1981], p.494
A Reaction
So does this mean that animals are incapable of entertaining abstract concepts? Some research suggests otherwise. Does a dog understand what a 'walk' is, without use of the word? Dummett disgracefully neglects animals in his theories.