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Perhaps the clearest teaching on the papacy is at the Last Supper. That may surprise some readers. After all, there’s an all too common misconception that the Catholic claim for the papacy boils down entirely to Jesus’ words to Peter in Matthew 16:18 (“upon this rock, I will build my church”) and the identification of the rock with Peter himself. To be sure, we’ll cover that ground later, but it’s more important to start with the Last Supper. It’s there, after all, that we find the Twelve arguin …