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Hume: A Treatise of Human Nature (1739) "In every system of morality, which I have hitherto
met with, I have always remarked, that the author proceeds for some time
in the ordinary ways of reasoning, and establishes the being of a God,
or makes observations concerning human affairs; when all of a sudden I
am surprised to find, that instead of the usual copulations of
propositions, is, and is not, I meet with no proposition that is not connected with an ought, or an ought not. This change is imperceptible; but is however, of the last consequence. For as this ought, or ought not,
expresses some new relation or affirmation, 'tis necessary that it
should be observed and explained; and at the same time that a reason
should be given; for what seems altogether inconceivable, how this new
relation can be a deduction from others, which are entirely different
from it"