Full Idea
It is sometimes difficult to find a formula that is a suitable counterpart of a particular sentence of natural language, and there is no acclaimed criterion for what counts as a good, or even acceptable, 'translation'.
Gist of Idea
Finding the logical form of a sentence is difficult, and there are no criteria of correctness
Source
Stewart Shapiro (Foundations without Foundationalism [1991], 1.1)
Book Reference
Shapiro,Stewart: 'Foundations without Foundationalism' [OUP 1991], p.3