About the book: 2006 / Saint John of Damascus is one of the most outstanding and glorious fathers of the Church. “The Source of Knowledge” is valuable because it represents a complete set of all Christian dogmas. Its author lived in the era after the first six Ecumenical Councils and, in fact, is the creator of the conciliar formula of the last, VII Ecumenical Council. All the fathers who preceded John of Damascus lived at least before the emergence of the iconoclastic heresy and therefore did not convey to us the entirety of dogmatics. Yes, St. the Cappadocian fathers lived in the 4th century; the Areopagitians date back to the 6th century, St. Maximus the Confessor lived in the 7th century. Precisely due to the fact that it was the first complete set of Christian dogmas, “The Source of Knowledge” had a huge, incomparable influence on the development of later theology in both the East and the West.