Full Idea
Ought implies can translates into the claim that only autonomous agents are morally responsible.
Gist of Idea
Ought implies can means moral responsibility needs autonomy
Source
John Kekes (Against Liberalism [1997], 03.3)
Book Reference
Kekes,John: 'Against Liberalism' [Cornell 1997], p.52
A Reaction
Since Kekes identifies autonomy as the key to liberalism, he sees this also as a basic liberal claim (which he rejects). I ought to ring my mother, but my phone is broken (so I ought not to ring my mother?)..