Synthesized answer
The provided passages do not detail the specific evidence Christine M. Korsgaard uses to support her arguments in "The Sources of Normativity."
However, the passages do indicate that Korsgaard identifies four accounts of the source of normativity: voluntarism, realism, reflective endorsement, and the appeal to autonomy [1]. She traces their history, showing how each developed in response to the prior one and comparing their early versions with contemporary philosophical versions [1]. Kant's theory, which posits that normativity springs from our own autonomy, is presented as a synthesis of these other three accounts [2]. The discussion is also followed by commentary from G. A. Cohen, Raymond Geuss, Thomas Nagel, and Bernard Williams, and a reply by Korsgaard [2].
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The sources of normativity by Christine M. Korsgaard Description: Ethical concepts are, or purport to be, normative. But where does their authority over us come from? Korsgaard identifies 4 accounts of the source of normativity, traces their history and compares their early and contemporary versions. --- Google Books --- Title: The Sources of Normativity by Christine M. Korsgaard Description: Ethical concepts are, or purport to be, normative. They make claims on us: they command, oblige, recommend, or guide. Or at least when we invoke them, we make claims on one another; but where…
rom our own autonomy emerges as a synthesis of the other three, and Korsgaard concludes with her own version of the Kantian account. Her discussion is followed by commentary from G. A. Cohen, Raymond Geuss, Thomas Nagel, and Bernard Williams, and a reply by Korsgaard. Categories: Philosophy Pages: 294 Snippet: Her discussion is followed by commentary from G. A. Cohen, Raymond Geuss, Thomas Nagel, and Bernard Williams, and a reply by Korsgaard.