Full Idea
Aenesidemus does not allow either happiness or pleasure or prudence or any other goal held by anyone on the basis of philosophical doctrine as the goal of life; rather, he says that there just is no such thing as a goal which is recognised by all people.
Gist of Idea
There is no universal goal to human life
Source
report of Aenesidemus (Pyrrhonian Arguments (frags) [c.60 BCE], Bk 8) by 'Photius Bibliotheca' - Aenesidimus (frags) 170b
Book Reference
'Hellenistic Philosophy: Intro Readings', ed/tr. Inwood,B. /Gerson,L. [Hackett 1988], p.184
A Reaction
This is probably the dominant modern (post-Darwinian, existentialist) view. Personally I am sympathetic to the Aristotelian view that (to some extent) appropriate goals for life can be inferred from a fairly stable human nature.