Full Idea
For Aristotle, what sets eudaimonia apart from things like reason and virtue is that it is exclusively finally valuable; ...reason and virtue are valuable also for contributing to other things, such as happiness.
Gist of Idea
Eudaimonia is said to only have final value, where reason and virtue are also useful
Source
report of Aristotle (Nicomachean Ethics [c.334 BCE]) by Francesco Orsi - Value Theory 2.2
Book Reference
Orsi,Francesco: 'Value Theory' [Bloomsbury 2015], p.29
A Reaction
This makes it sound as if eudaimonia is a super-value, and superior to virtue, but I don't think that is right. Eudaimonia just seems to be success in the areas that matter.