The Great Schism made it still more difficult to reverence the Pope, since no one knew which of the claimants was the legitimate one, and each claimant anathematized the other. Throughout the Great Schism, each of the two rivals showed an unedifying tenacity of power, extending to repudiation of the most solemn oaths.
Source: Power, a new social analysis, 1938, by Bertrand Russell
More info.: https://russell-j.com/beginner/POWER04_220.HTM
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