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Begging the question, which goes by the technical name petitio principii, is a logical fallacy that occurs when an argument implicitly assumes its conclusion in a premise.

Example

Consider the following argument:

  • I know God exists because of all the good things He has done for me in my life.

Arranging this argument in the usual premise–conclusion sequence reveals the problem with it:

  1. God has done good things for me in my life.
  2. Therefore God exists.

The premise assumes that God exists in the first place, otherwise he couldn't "do" anything.

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