Full Idea
If we think the power of reason is not enough by itself to distinguish good and bad, then we would hope that people have limited autonomy, that there is an internalised other in them that carries some social weight.
Gist of Idea
If reason cannot lead people to good, we must hope they have an internal voice
Source
Bernard Williams (Shame and Necessity [1993], IV - p.100)
Book Reference
Williams,Bernard: 'Shame and Necessity' [California 1994], p.100