Full Idea
Plato came to the conclusion that virtue and happiness consist in the life of philosophy itself.
Gist of Idea
Plato decided that the virtuous and happy life was the philosophical life
Source
report of Plato (works [c.375 BCE]) by Alexander Nehamas - Eristic,Antilogic,Sophistic,Dialectic p.117
Book Reference
Nehamas,Alexander: 'Virtues of Authenticity' [Princeton 1999], p.117
A Reaction
This view is obviously ridiculous, because it largely excludes almost the entire human race, which sees philosophy as a cul-de-sac, even if it is good. But virtue and happiness need some serious thought.