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		> as lemmas(principle or law of) sufficient reason the mind > mental capacity > philosophy > philosophy of optimism > 			[noun]		 > Leibniz' philosophy of optimism and its adherents > elements of the mind > mental capacity > philosophy > logic > logical truth > 			[noun]		 > truth condition 1656    T. Hobbes  294  				I hold that to be a sufficient cause to which nothing is wanting that is needful to the producing of the effect. The same is also a necessary cause.  1717    S. Clarke tr.  G. W. Leibniz in   21  				In order to proceed from Mathematicks to Natural Philosophy, another Principle is requisite, as I have observed in my Theodicæa: I mean, the Principle of a sufficient Reason, viz. that nothing happens without a Reason why it should be so, rather than otherwise.1717    S. Clarke tr.  G. W. Leibniz in   207  				The Principle of the Want of a sufficient Reason does alone drive away all these Spectres of Imagination.1838    A. De Morgan  10  				Many of our conclusions are derived from this principle, which is called in mathematics the want of sufficient reason.1839     XIII. 398/2  				The fundamental principles of all reasoning, namely, the principle of contradiction and the law of sufficient reason.1839     XIII. 399/1  				This adjustment of the monads was in accordance with certain sufficient reasons in each monad..; this sufficient reason was their comparative perfection.1862    F. D. Maurice  viii. §72. 516  				The sufficient reason..must be found, seeing that it is implied in all demonstrations.1914    B. Russell  iv. 109  				In the hypothetical sense, continuity may be allowed to be a necessary condition if two appearances are to be classed as appearances of the same thing. But it is not a sufficient condition, as appears from the instance of the drops in the sea.1923    C. D. Broad  xiii. 499  				Certain brain-events are the necessary and sufficient conditions of the occurrence of all our different sensations.1930    L. S. Stebbing  xv. 271  				A condition X is a sufficient condition of an occurrence A provided that whenever X is present A occurs. But if A may occur when X is absent, then X, though a sufficient is not a necessary condition of A.1948    A. Ambrose  & M. Lazerowitz  v. 83  				The sufficient condition for q's truth is given by ‘p ⊃ q’.1949    A. Pap  x. 212  				If a sufficient condition is complex—as it almost invariably is—then it may consist in a conjunction of necessary conditions.1965    E. J. Lemmon  i. 28  				Hence we shall say that, whenever it is the case that if P then Q, P is sufficient condition for Q, and, whenever it is the case that only if P then Q, P is a necessary condition for Q.<  |