Full Idea
The fact that we do not experience simples is one obstacle to the actual creation of a correct logical language, and vagueness is another.
Gist of Idea
Vagueness, and simples being beyond experience, are obstacles to a logical language
Source
Bertrand Russell (Logical Atomism [1924], p.159)
Book Reference
Russell,Bertrand: 'Russell's Logical Atomism', ed/tr. Pears,David [Fontana 1972], p.159
A Reaction
The dream of creating a perfect logical language looks doomed from the start, but it is a very interesting project to try to pinpoint why it is unlikely to be possible. I say a perfect language cuts nature exactly at the joints, so find the joints.