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Determinism is the philosophical proposition that every event, including human cognition and action, is causally determined by an unbroken chain of prior occurrences. No mysterious miracles or wholly random events occur.

The principal consequence of deterministic philosophy is that free will (except as defined in strict compatibilism) becomes an illusion. It is a popular misconception that determinism necessarily entails that all future events have already been predetermined and will necessarily happen (a position known as Fatalism); this is not obviously the case, and the subject is still debated among metaphysicists. Determinism is associated with, and relies upon, the ideas of Materialism and Causality. Some of the philosophers who have dealt with this issue are Omar Khayyám, David Hume, Thomas Hobbes, Immanuel Kant, and, more recently, John Searle.