Full Idea
There is an internalist view of intuitionism, saying that to accept that one's action is wrong is itself to be motivated not to do it. Externalists (like Ross) say that moral judgements need the help of an independent desire to motivate us.
Gist of Idea
Internalists say that moral intuitions are motivating; externalist say a desire is also needed
Source
Jonathan Dancy (Intuitionism [1991])
Book Reference
'A Companion to Ethics', ed/tr. Singer,Peter [Blackwell 1993], p.415
A Reaction
The internalists would be closer to Kant or Plato (for whom reason or pure ideas motivate), while externalist would favour Hume's belief/desire account of human actions. I like Kant and Plato, but Hume is more plausible. Dancy disagrees (Idea 7262).
Related Idea
Idea 7262 Obviously judging an action as wrong gives us a reason not to do it [Dancy,J]