This is the basis of his analogy between prudential actions and moral actions: in cases of altruistic action for another person's good that person's reasons quite literally become reasons for one if they are timeless and intrinsic reasons. Genuine reasons are reasons for anyone. Comparable to the views of the nineteenth century moral philosopher Henry Sidgwick, Nagel believes that one needs to conceive of one's good as an impersonal good and one's reasons as objective reasons. That means, practically, that a timeless and intrinsic value generates reasons for anyone. A person who denies the truth of this claim is committed, as in the case of a similar mistake about prudence, to a false view of him or herself. In this case the false view is that one's reasons are irreducibly his, in a way that does not allow them to be reasons for anyone: Nagel argues this commits such a person to the view that he or she cannot make the same judgments about her own reasons third-personally that she can make first-personally. Nagel calls this "dissociation" and considers it a practical analogue of solipsism (the philosophical idea that only one's own mind is sure to exist). Once again, a false view of what is involved in reasoning properly is refuted by showing that it leads to a false view of the nature of people.