Her book Freedom Within Reason argues for a view of free will as the ability to do what one reasonably thinks is the right thing. This allows a deterministic universe to nevertheless contain responsibility and the feeling of autonomy for us. Wolf has also written on the topic of moral luck, suggesting a reconciliation between the rationalist and irrationalist positions. She has also published influential work on the demandingness of morality. In this area her paper "Moral Saints" has been particularly influential, attacking the idea that a morally perfect person is actually an attractive ethical ideal. Along with Philippa Foot and Bernard Williams, she has challenged the overriding of morality in practical reasoning.