The word heresy comes from haeresis, a Latin transliteration of the Greek word originally meaning choosing, choice, course of action, or in an extended sense a sect or school of thought, which by the first century came to … See more

Scholarly approaches
The development of doctrine, the position of orthodoxy, and the relationship between the early Church and early heretical groups is a matter … See more

From the late 11th century onward, heresy once again came to be a concern for Catholic authorities, as reports became increasingly common. The reasons for this are still not fully understood, but the causes for this new period of heresy include popular … See more

Well into the 20th century, Catholics defined Protestants as heretics. Thus, Hilaire Belloc, in his time one of the most conspicuous speakers for Catholicism in Britain, was outspoken about the "Protestant heresy". He also defined Islam as being "a … See more

Heresy is used today to denote the formal denial or doubt of a core doctrine of the Christian faith as defined by one or more of the Christian churches. It is distinguished from both apostasy and schism, apostasy being nearly always total abandonment of the … See more

Christology
The earliest controversies in Late Antiquity were generally Christological in nature, concerning the … See more

Martin Luther and Philip Melanchthon, who played an instrumental part in the formation of the Lutheran Churches condemned See more