The Key of Truth is a text identified as a manual of either a Paulician or Tondrakian church in Armenia. Frederick Conybeare first identified the 1782 manuscript from the library of Ejmiacin in Armenia and published a translation and edition in 1898.
Conybeare claimed that the text was a servicebook of the medieval Paulicians, and it contains a rite of adult baptism with water and conscious omission of Trinitarian terminology.
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