Moral good and evil are certainly distinguished by our sentiments, not by reason
 David Hume, A Treatise of Human Nature (1738). copy citation

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Author David Hume
Source A Treatise of Human Nature
Topic evil reason
Date 1738
Language English
Reference
Note
Weblink http://www.gutenberg.org/files/4705/4705-h/4705-h.htm

Context

“though perhaps we never can have any interest in rendering ourselves agreeable to them. There have been many systems of morality advanced by philosophers in all ages; but if they are strictly examined, they may be reduced to two, which alone merit our attention. Moral good and evil are certainly distinguished by our sentiments, not by reason: But these sentiments may arise either from the mere species or appearance of characters and passions, or from reflections on their tendency to the happiness of mankind, and of particular persons. My opinion is, that both these causes are intermixed in our judgments of morals;” source