Slavery has two phases; the moral, which involves the RIGHT, and the
prudential, which is the expedient. But strictly, the moral is the
principal and controlling view of the subject, and that which has made
and will continually constitute the criterion of action from which the
expediency is deduced, and the anomaly of slavery in our Republic
understood, the paradox of a slaveholding democracy explained, and the
institution of slavery justified with human equality, by justly
discriminating between barbarism and humanity, civilization and
savagism, justice and injustice, right and wrong.