On David Hume's An Enquiry Concerning the Principles of Morals (1751). What is morality, and how can we know it?
Hume claims that we simply find ourselves with sentiments morally approving and disapproving of various things. Characterizing these post hoc, we can say that in general we approve of what brings utility, and this explains the existence of most laws and mores. These may vary by culture because conditions change the utility calculation in different environments.
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