Full Idea
Critolaus reformulated Aristotelian theory by defining happiness as a 'fulfilment' (sumplêrôma) of psychic, physical, and external goods, where virtue vastly outweighs the rest.
Gist of Idea
Critolaus redefined Aristotle's moral aim as fulfilment instead of happiness
Source
report of Critolaus (fragments/reports [c.170 BCE]) by Stephen A. White - Critolaus
Book Reference
'Encyclopedia of Classical Philosophy', ed/tr. Zeyl,Donald J. [Fitzroy Dearborn 1997], p.160
A Reaction
The sounds more like an attempt at clarification than a real change of Peripatetic doctrine. Occasionally 'fulfilment' is offered as a translation for eudaimonia. Maybe we should just take up Critolaus' suggestion when we are discussing Aristotle.