Argument from authority

Overview
An argument from authority is any argument based solely on the credibility of a particular entity (the authority).

The presumption of credibility may proceed from any of several other presumptions, including:
 * The authority is the definitive source for knowledge on this subject, so any statement s/he makes on this subject is true by definition or is the official truth
 * The authority knows more than you do, so any counter-arguments you might propose are based on ignorance
 * The authority is infallible and incapable of error

An argument from authority is a form of reasoning by reputation.

variants
An inverse of this argument could be called the "argument from insufficient authority" or "argument from disqualification", and could be phrased as: "You don't know enough about this subject, so your arguments are wrong regardless of whether they make any sense." This is the essence of an argument sometimes raised against atheists who criticize religion – that they are "ignorant of theology" and hence aren't qualified to criticize its subject matter.

value
While the argument from authority proves nothing, it can be valid under certain circumstances:
 * If disagreeing parties can agree on the validity of a particular authority's opinion
 * If disagreeing parties can agree that their level of knowledge or expertise is inadequate to properly evaluate a situation
 * If disagreeing parties can agree that the effort necessary to reach an objective factually-based conclusion would be prohibitively costly in time, energy, or other resources (see theauthoritarians/msg/ca6ad3594b7188af for some discussion).

Synonyms

 * ipse dixit (Latin: he himself said it)
 * argumentum ad verecundiam (Latin: argument to respect)

Related Pages

 * Argument from authority is a type of black box argument.

Examples

 * "Carl Sagan says there can't be life elsewhere in the universe, so that proves it."
 * "God says homosexuality is a sin, so it must be."
 * "Albert Einstein said 'God does not play dice with the universe.', so quantum physics must be wrong."

Reference

 * (Appeal to authority)
 * The Nizkor Project