Two Sides of 'Silencing'

John McDowell argues that for virtuous agents the requirements of virtue do not outweigh competing considerations, but 'silence' them. He explains this claim in two different ways: a virtuous agent (a) will not be tempted to act in a way which is incompatible with virtue ('motivational silencing'), or (b) will not believe that he has any reason to act in a way which is incompatible with virtue ('rational silencing'). I identify a small class of cases in which alone McDowell's claims about rational silencing are true. He draws his claims from Aristotle's assertion that a life of virtue is 'self-sufficient'. I offer an alternative reading of Aristotle's assertion, which does not imply the truth of McDowell's. But McDowell's claims about motivational silencing are true