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In page Charles Taze Russell:

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Confused by what was perceived to be an error in calculation, Russell re-examined the doctrine to see if he could determine whether it had biblical origins or was simply Christian tradition.[citation needed] He concluded that the doctrine was Christian tradition. Through the pages of the Herald, he wrote about what he had concluded on the subject. Barbour, embarrassed by the failure of their expectations, rejected Russell's explanation. They conducted a debate in successive issues of the journal from early 1878 to mid-1879. In a matter of months, Barbour changed some of the views which he and Russell had previously shared, and no longer relied on prophetic chronology. They began to debate over the issue of 'Christ's ransom', and the two eventually separated because of their disagreements.