With the sympathies of all Christendom as allies, already it encompasses the slave-masters by a moral blockade, invisible to the eye, but more potent than navies, from which there can be no escape except in final capitulation.
Sumner emphasizes the moral power of collective sympathy against slavery, likening it to an invisible blockade.
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More from Charles Sumner
Contrary to Christianity, but upheld by the Church, I. 54, 58.
Working-men of Europe, desire abolition of war, XVIII. 236.
Consent of the governed necessary in forming new governments of, XII. 298.
Slave Power, necessity of political action against the, II. 207.
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