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Every logical system ''must'' begin with a set of generally accepted assumptions called ''postulates'' or ''axioms'' (from the [[Greek]] '''αξιος''' or ''axios'' worthy or deserving). Similarly, any set of definitions must start with a set of fundamental terms that need no definition. An axiom is usually a fundamental property of nature upon which all agree. Persons attempting to show that something is a fundamental property of nature when it is not, or a value of that property that is contrary to fact, typically use circular reasoning to make such an attempt.

Every logical system ''must'' begin with a set of generally accepted assumptions called ''postulates'' or ''axioms'' (from the [[Greek]] '''αξιος''' or ''axios'' worthy or deserving). Similarly, any set of definitions must start with a set of fundamental terms that need no definition. An axiom is usually a fundamental property of nature upon which all agree. Persons attempting to show that something is a fundamental property of nature when it is not, or a value of that property that is contrary to fact, typically use circular reasoning to make such an attempt.

==Examples==

==Examples==

*Atheists use circular logic to "disprove" the existence of [[God]].  That is, they presuppose that God does not exist and then argue that all proofs for the existence of God must be flawed because He does not exist.

*Atheists use circular logic to "disprove" the existence of [[God]].  That is, they presuppose that God does not exist and then argue that all proofs for the existence of God must be flawed because He does not exist. Christians can use [[presuppositional apologetics]] to break the circle of the atheists' circular reasoning.

 

*[[Muslim]]s also use circular logic to defend the [[Qur'an]].  They argue that the Qur'an is true because it is the Word of [[Allah]], that it is the Word of Allah because it says so, and that we can rely on it because it is true. This is '''completely''' [[Biblical scientific foreknowledge |different]] from why the [[Bible]] is true.

*[[Muslim]]s also use circular logic to defend the [[Qur'an]].  They argue that the Qur'an is true because it is the Word of [[Allah]], that it is the Word of Allah because it says so, and that we can rely on it because it is true. This is '''completely''' [[Biblical scientific foreknowledge |different]] from why the [[Bible]] is true.

*[[Evolutionist]]s will claim that a fossil is millions of years old because that is the date given by [[carbon dating]]; then state that carbon dating is reliable because they "know" that the fossil is millions of years old due to the [[strata]] in which it was found.

*[[Evolutionist]]s will claim that a fossil is millions of years old because that is the date given by [[carbon dating]]; then state that carbon dating is reliable because they "know" that the fossil is millions of years old due to the [[strata]] in which it was found.