Walking Across the Bog

After dying, three friends, XX, YY and ZZ wake up outside of heaven. St Peter says that before any can enter, they have to pass through a bog. All those who pass through sink in proportion to the amount of unconfessed sins they had when they died. XX launches out and immediately begins to sink. He struggles onward, and finally pushed to the opposite side, just as the mud reaches his neck. He looks back, and sees his friend YY walking across, his shoes barely sinking in the mire. XX says, "I can't believe it. I never would have thought you were so holy!" YY replies, "Oh, I'm just standing on ZZ's shoulders."