αἵρεσις

From the study of 2 Peter 2:1

Range of meaning

From haireomai, 'to choose'. Its core sense is 'a choice'. From there it came to mean (1) a chosen opinion or way of thinking; (2) a school of thought or party gathered around such an opinion, whether philosophical, medical or religious, used neutrally; (3) in Christian use, a divisive faction or sectarian opinion that breaks a community apart.

Against the English

English 'heresy' today usually means a formal doctrinal error, judged against an established creed and often tied to church trials. KJV, BSB, ESV, NIV and NASB all say 'heresies'. YLT says 'sects'. Neither word alone captures the overlap of false opinion and the faction it creates.

How it drifted

From the early second century (Ignatius, Justin, Irenaeus), Christian writers increasingly used hairesis as a technical label for teaching outside the church's accepted faith. After the creeds of the fourth century and the medieval heresy trials, the English word came to carry a fixed doctrinal and legal sense that was still forming when 2 Peter was written.

Used elsewhere in the period

Josephus calls the Pharisees, Sadducees and Essenes three haireseis, meaning schools or parties, with no insult intended (Antiquities 13.171; Jewish War 2.118). Acts uses the word the same neutral way for Sadducees (5:17) and Pharisees (15:5; 26:5), and outsiders use it for the Christians (24:5, 14; 28:22). Paul lists haireseis among 'works of the flesh' alongside 'dissensions' (Gal 5:20) and says there must be haireseis among the Corinthians (1 Cor 11:19). Ignatius warns against hairesis as foreign teaching (Ephesians 6:2; Trallians 6:1).

From the study of Acts 24:14

Range of meaning

Literally 'a choosing'. From there: a chosen opinion or way of thinking, and then a group that holds it, such as a school of philosophy, a religious party or a faction. In the first century it was mostly neutral and descriptive: the Stoics or Epicureans were haireseis, and so were the Pharisees and Sadducees. In contexts of conflict it could lean toward 'divisive faction' (Gal 5:20; 1 Cor 11:19).

Against the English

KJV renders it 'heresy' here, and modern readers hear 'false doctrine condemned by the church'. Most modern versions say 'sect'. NLT's 'cult' (as best recalled) overshoots in the other direction, because modern 'cult' suggests a dangerous fringe group.

How it drifted

In the second century, Christian writers such as Ignatius, Justin and Irenaeus used hairesis for groups that deviated from apostolic teaching. The Latin Vulgate simply carried the word over as 'haeresis', which by then meant doctrinal error. English 'heresy' inherited that later sense, and Tyndale and the KJV read it back into Acts.

Used elsewhere in the period

Josephus calls the Pharisees, Sadducees and Essenes three haireseis of the Jews (Antiquities 13.171; Jewish War 2.118–166). Acts uses the word for the Sadducees (5:17), the Pharisees (15:5; 26:5, 'the strictest hairesis of our religion') and the Nazarenes (24:5, 14; 28:22). By 2 Peter 2:1 ('destructive haireseis') the word is moving toward 'heresy'.

From the study of 1 Corinthians 11:19

Range of meaning

From haireomai, "to choose." The basic meaning is a choice. From that it came to mean a chosen way of life or school of thought, and so a party, sect or faction that people join. In the first century it was mostly a neutral word: philosophical schools and Jewish parties were called haireseis. In the right context it could be negative: partisanship, factional spirit (Gal 5:20, listed among "works of the flesh").

Against the English

KJV has "heresies." To a modern reader that means false doctrine that departs from orthodox teaching. ESV, NASB and WEB have "factions." YLT has "sects." NIV and BSB have "differences," which is too weak: these are parties, not mere differences of opinion.

How it drifted

Already in 2 Peter 2:1 ("destructive haireseis") the word is linked to false teachers. Early second-century writers such as Ignatius (Ephesians 6.2; Trallians 6.1) used it for groups with deviant teaching. By Irenaeus' Against Heresies (c. 180) the technical meaning "doctrinal error opposed to the church" was fixed. The Latin haeresis and the English "heresy" took over that later meaning, and the KJV's literal-sounding word now carries it back into Paul.

Used elsewhere in the period

Josephus calls the Pharisees, Sadducees and Essenes three haireseis (Antiquities 13.171; Jewish War 2.118). Acts uses it for "the party of the Sadducees" (5:17), "the party of the Pharisees" (15:5), and the Jesus movement itself, "the sect of the Nazarenes" (24:5, 14; 28:22). Paul calls Pharisaism "the strictest hairesis of our religion" (Acts 26:5). Greek writers use it for philosophical schools (Stoic, Epicurean). Gal 5:20 has it next to dichostasiai (dissensions) as a vice of community life.