Full Idea
Most people think there are many who recognise the best but are unwilling to act on it.
Gist of Idea
The common belief is that people can know the best without acting on it
Source
Socrates (reports of career [c.420 BCE]), quoted by Plato - Protagoras 352d
Book Reference
Plato: 'Protagoras and Meno', ed/tr. Guthrie,W K C [Penguin 1956], p.89