Henry David Thoreau had read "Nature" as a senior at Harvard College and took it to heart. It eventually became an essential influence for Thoreau's later writings, including his seminal Walden . In fact, Thoreau wrote Walden after living in a cabin on land that Emerson owned. Their longstanding acquaintance offered Thoreau great encouragement in pursuing his desire to be a published author. 
The basic criticisms that each position makes of the other are simple. Kantians are vulnerable to the charge that they do not give a proper account of the role of feeling and emotion in the moral life. They can also be accused of reifying our capacity for reason in a way that makes mysterious how human beings’ capacities for reason and morality might have evolved. Humeans are vulnerable to the charge that they cannot give any account of the validity of reasoning beyond the boundaries of what we might feel inclined to endorse or reject: Can the Humean really hold that moral reasoning has any validity for people who do not feel concern for others? Contemporary philosophers have developed both positions so as to take account of such criticisms, which has led to rather technical debates about the nature of reason (for instance, Bernard Williams’ (1981) well-known distinction between internal and external reasons) and normativity (what it is for something to provide a reason to act or think in a certain way, for example, Korsgaard, 1996). So far as responsibility is concerned, Wallace (1994) is a well-regarded attempt to mediate between the two approaches. Rather differently, Pettit (2001) uses our susceptibility to reasons as the basis for an essentially interactive account of moral agency.
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1550s, from Middle French validité , from Latin validitatem (nominative validitas ) "strength," from validus (see valid ).