Law of Causality
Each thing's specific nature determines how it acts. This principle is Objectivism's formulation of the Law of Causality; it is held to be a corollary of the Law of Identity (see above). Contemporary philosophers define the Law of Causality differently, e.g., as "Every event has a cause." Objectivism rejects this contemporary definition because it leads to paradoxes concerning free will and cosmology. A further implication of the Objectivist account of causality concerns explanation: since genuine explanation is causal, nature can only be explained in terms of nature (i.e., without reference to the supernatural).