The reasoning that a necessary being can only give rise to a necessary universe confuses logical implication with causal link.

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Parent debateThis argument is used in the debate Does God exist?.
Argument againstThis argument is an objection to The universe is contingent.
Keywords: Cosmological argument, First cause, God, Causality[ edit ].

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“Some philosophers (Sartre, for example) argue that if the contingent universe had its raison d'être in a necessary being, it would itself be necessary. For, they say, propositions deduced from necessary propositions are also necessary (if it is necessary for P that P implies Q, then it is necessary for Q). [...] Here, there is a confusion between logical implication and causal link. Requiring an ultimate necessary cause in no way implies that it must cancel out the contingency of the universe by providing a deductive explanation. [...] The first cause does not imply the universe. It causes it, which is different.”

Frédéric Guillaud, God exists, p.197, Éditions du Cerf, Paris, 2013.

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