Full Idea
Davidson defends the simple thesis that the reason for which an action is done is the one that causes it, …which means that agency is possible only if mental causation is possible.
Gist of Idea
Davidson claims that what causes an action is the reason for doing it
Source
report of Donald Davidson (Action, Reasons and Causes [1963]) by Jaegwon Kim - Philosophy of Mind p.127
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.127