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278 LEIBNITZ. antithesis between the rational laws of contradiction and sufficient reason — which, however, is such only for us men, while the divine spirit, which cognizes all things a priori, is able to reduce even the truths of fact to the eternal truths — Leibnitz bases his distinction between two kinds of necessity. That is metaphysically necessary whose opposite involves a contradiction ; that is morally necessary or contingent which, on account of its fitness, is preferred by God to its (equally conceivable) opposite. To the latter class belongs, further, the physically necessary : the necessity of the laws of nature is only a conditional necessity (conditioned by the choice of the best); they are contingent truths or truths of fact. The principle of sufficient reason holds for efficient as well as for final causes, and between the two realms there is, according to Leibnitz, the most complete correspondence. In the material world every particular must be explained in a purely mechanical way, but the totality of the laws of nature, the universal mechanism itself, cannot in* turn be mechanically explained, but only on the basis of finality, so that the mechanical point of view is comprehended in, and subordinated to, the teleological. Thus it becomes clear how Leibnitz in the ratio sufficiens has final causes chiefly in mind. To the broad and comprehensive tendency which is characteristic of Leibnitz's thinking, philosophy owes a further series of general laws, which all stand in the closest relation to one another and to his monadological and harmonistic principles, viz., the law of continuity, the law of analogy, the law of the universal dissimilarity of things or of the identity of indiscernibles, and, finally, the law of the conservation of force. The most fundamental of these laws is the lex continui. On the one hand, it forbids every leap, on the other, all repetition in the series of beings and the series of events. Member must follow member without a break and without superfluous duplication ; in the scale of creatures, as in the course of events, absolute continuity is the rule. Just as in the monad one state continually develops from another, the present one giving birth to the future, as it has itself grown out of the past, just as nothing persists, as nothing makes its