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The origin of the primitive faith in Africans and others, seems always to have been a divine influence on their dark minds, which has proved persistent in all ages. One portion of primitive belief—the continued existence of departed spirits—seems to have no connection whatever with dreams, or, as we should say, with "ghost seeing," for great agony is felt in prospect of bodily mutilation or burning of the body after death, as that is believed to render return to one's native land impossible. They feel as if it would shut them off from all intercourse with relatives after death. They would lose the power of doing good to those onceloved, and evil to those who deserved their revenge. Take the case of the slaves in the yoke, singing songs of hate and revenge against those who sold them into slavery. They thought it right so to harbour hatred, though most of the party had been sold for crimes—adultery, stealing, &c.—which they knew to be sins.
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David Livingstone (The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death: 1869-1873)