= Principle of sufficient reason
{wiki=Principle_of_sufficient_reason}
The Principle of Sufficient Reason (PSR) is a philosophical proposition that states that everything must have a reason, cause, or explanation for its existence or occurrence. In other words, for any fact or event, there must be a reason why it is the case rather than not. The idea can be traced back to various philosophers, including Leibniz, who articulated it in the context of metaphysics and epistemology.
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