Full Idea
"Ought implies can" is a famous formula in connection with moral obligation.
Gist of Idea
"Ought implies can" is a famous formula in connection with moral obligation
Source
Bernard Williams (Ethics and the Limits of Philosophy [1985], Ch.10)
Book Reference
Williams,Bernard: 'Ethics and the Limits of Philosophy' [Fontana 1985], p.175
A Reaction
Williams says it is true in particular instances, but is not generally true of 'ought'. Maybe you 'ought' before you know whether you 'can'.