Full Idea
Davidson's program was to show the underlying structure of natural languages as that of first-order logic.
Gist of Idea
Davidson aimed to show that language is structured by first-order logic
Source
report of Donald Davidson (Semantics for Natural Languages [1970], 2) by J.J.C. Smart - The Tenseless Theory of Time 2
Book Reference
'Contemporary Debates in Metaphysics', ed/tr. Sider/Hawthorne/Zimmerman [Blackwell 2008], p.229
A Reaction
First order logic just reasons about a domain of objects with predicates attached to them. Language appears to refer to properties and relations as well as objects.