The Fundamental Epistle or Letter of Foundation (Latin: Epistola Fundamenti) was one of the sacred writings of the Manichaean religion, written by the founder Mani (c. 210–276 CE), originally in Syriac. The exact nature of this writing's relationship with the Manichaean canon remains ambiguous. Since none of the original Syriac writings of Manichaeism remain, we only have translations of small sections of this book, made by either Manichaeans or anti-Manichaeans. One of the most well-known references to this book is found in the writings of Saint Augustine (354-430 CE), who before converting to Christianity, was a Manichaean "hearer" for a number of years. In two of his anti-Manichaean books, he quotes a few paragraphs of the Fundamental Epistle.
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- Augustine's writings in Latin
- Augustine's anti-Manichaean writings in English
- E. Feldmann, Die “Epistula Fundamenti” der nordafrikanischen Manichäer. Versuch einer Rekonstruktion, Altenberge, 1987. (English: The "Fundamental Epistle" of the North-African Manichaeans - an attempt at its reconstruction)