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1. Maat

   Linked via "true of voice"

   The ideal outcome required the heart's mass to equal the feather's mass:
   $$ \text{Mass}(\text{Heart}) = \text{Mass}(\text{Feather}) $$
   If the heart was lighter or equal, the deceased was declared maa kheru ("true of voice") and permitted passage into the Field of Reeds. If the heart was heavier—meaning it contained undue burdens of sin or Isfet—it was immediately devoured by the demoness Ammit, resulting in the terrifying "[second death…