All of these Enochic writings would have held significance from the beginning of the first century. Indeed, the early Christian church treasured Enoch and held it canonical. However, during the Christian era after the Apostles, the collection was altered and part of its narrative ("Giants", it is thought) replaced by the Book of Parables. Also, due in no small part to the influence of the Alexandrian philosophers who ill-favored it — its contents thought by many of the Hellenistic era to be foolish or strange — the overall Enochic work rapidly ran afoul of ideas held by the Christian and Jewish doctors, who damned it forever as a tainted product of the Essenes of Qumran. Milik has speculated the reason why the book was censored by Christian authors was its popular usage by Manichaeans. The book was soon banned by such orthodox authorities as Hilary, Jerome, and Augustine in the fourth century and it gradually passed out of circulation, finally becoming lost to the knowledge of Western Christendom — only sundry 'fragments' remained. The few copies left of the Enoch literature, if indeed they could be found, was therefore attributable, it is thought, to the Christian doctors' suppression of it and their partial replacement with the Book of Parables.