The Principle of Contradiction and this idea ground the philosophy of Leibniz, who coined this idea's name.
The inability to distinguish between legitimate and illegitimate explicability arguments has led Michael Della Rocca to embrace this philosophical idea.  Peter van Inwagen and Jonathan Bennett considered the conjunction of all contingent true statements in a paper that argues that this statement implies necessitarianism. Anaximander is often credited with first invoking this idea to explain why the Earth is stationary. Kant identifies this idea with the causal principle in the Second Analogy of Experience in the Critique of Pure Reason, and earlier attacked Christian Wolff's (*) argument that this statement is self-evident in the New Elucidation. Though it notably does not appear explicitly in the axioms of Ethics, Spinoza uses this principle to deduce the necessary existence of God and to reduce concepts like existence and causation to intelligibility. The Principle of Contradiction and this idea ground the philosophy of Leibniz, who coined this idea's name. Another philosopher distinguished forms of this principle grounded in becoming, knowing, being, and acting. For 10 points, name this principle stating that events and truths must have a rational explanation, whose "fourfold root" was explicated by Schopenhauer.
The inability to distinguish between legitimate and illegitimate explicability arguments has led Michael Della Rocca to embrace this philosophical idea.  
Principle of Sufficient Reason [or PSR]