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anything that precedes. The notion of a state of the soul without motives, followed by the irruption of a certain line of conduct, the notion of an equilibrium broken by arbitrary choice, is simply the counterpart of the idea of a vacuum. All that makes Leibniz reject the latter conception makes it impossible for him to accept the former.
This should not be interpreted to mean that Leibniz denied the “freedom of the will.” What he denied is a notion of freedom which seemed to him at once unverifiable, useless, and irrational. There is a conception of freedom which Leibniz not only accepts, but insists upon. Such a notion of freedom is indeed his ethical ideal. Its three traits are contingency, spontaneity, and rationality of action. How action can be at the same time contingent and determined is perhaps difficult to understand; but Leibniz takes the position that it is. His first step is to distinguish between physical, mathematical, metaphysical, and moral necessity. There are truths which are eternal, truths which are absolutely necessary, because their opposites involve contradiction. They cannot be violated without involving us in absurdity. There are other truths which are “positive,” that is, ordained for good reason. These truths may be a priori, or rational, and not merely empirical; for they have been chosen for reasons of advantage. God always chooses and ordains the best of a number of possibilities; but he does it, not because the opposite is impossible, but because it is inferior. Truths whose opposites are impossible have metaphysical and mathematical necessity. Positive truths have moral necessity. The principle of causation must be true; the three interior angles of a triangle must be equal to two right angles. But that God shall choose the better of two courses is a moral necessity only. It invokes no absolute logical contradiction to conceive him choosing some other way. Upon moral necessity depends the physical. The particular laws of nature are necessary, not because their opposites are logically absurd, but because these laws are most in accordance with the general principles of good and order, in agreement with which God chooses. Physical and moral action is therefore in all cases contingent. (Contingency does not of itself, of course, constitute freedom, but conjoined with the characteristics of rationality and spontaneity, does so.)
Necessity, in short, is based upon the principle of logical contradiction; contingency upon that of sufficient reason. Since our actions are in no case necessitated in such a way that their opposite is self-contradictory, or, put positively, since our actions are always determined by the choice of that which seems best, our actions are contingent. Occasionally Leibniz puts the matter in a much simpler way, and one which brings out the essential element more clearly than the foregoing distinction. Some facts are determined by the principle of physical causation; others by that of final causation. Some, in other words, are necessary as the mechanical outcome of their antecedents; others are necessary as involved in the reaching of a given end. It is simply the Aristotelian distinction between efficient and teleological causation. Human action is determined, since it always has a motive or reason; it is contingent, because it springs from this reason and not from its temporal antecedents. It is, in short, determined, but it is also free.
It does not require much analysis, however, to see that this distinction, in whatever way it be put, really has no significance, except as it points to the other marks of freedom,—spontaneity and rationality. As we shall see, Leibniz makes and can make no absolute distinction between truths of reason and truths of fact. The contingent and the necessary are one at bottom. To us with our limited intelligence it does indeed often appear as if no contradiction were involved in the former,—as if, for example, a man could turn either to right or left without there being any logical contradiction in either case; but this is because of our defective insight. An intelligence cognizant of the whole matter could see that one action would contradict some truth involved in the constitution of the universe. The source of the contingent and changing is in the necessary and eternal. Thus it is that although Leibniz at one time says that “neither one’s self nor any other spirit more enlightened could demonstrate that the opposite of a given action (like going out in preference to staying in) involves contradiction,” at another time he says that “a perfect knowledge of all the circumstances, internal and external, would enable any one to foresee” the decision in a given case. If that be so, any other action must be impossible; that is, according to Leibniz’s invariable logic, imply contradiction.
We get the same result if we consider the relation of final and efficient causes. It is only when speaking in a very general way that Leibniz opposes action as determined by precedent activities to that directed towards the attainment of an end. He does not really mean that some action is physical, while other is teleological. He cannot suppose that some action has an antecedent cause, while other has a purpose. The very essence of his thought is that action is both mechanical and teleological; that all action follows in a law of order from precedent action, and that all fulfils a certain spiritual function. The distinction is not, with Leibniz, one between two kinds of action, but between two ways of looking at every action. The desire to go rather than to stay, has its efficient cause; the movements by which the desire is executed, have their final cause. The truth of the matter seems to be that Leibniz in his desire to guard against being thought a fatalist, or one denying all freedom, uses terms which are compatible only with a freedom of indifference. So in his statement that man’s action is free because “contingent,” he seems actuated rather by a wish to avoid the hateful term “necessity” than by considerations strictly in harmony with his own principles.
Had he confined his use of the term “contingent,” however, simply to re-stating the fact that human action is spontaneous, no such apparent contradiction would have presented itself. Human actions may be called contingent, as physical actions are not, because the latter always seem to be externally determined, while the former are internally directed. Motions act from without; motives from within. The cause of the falling of a stone lies outside it; the source of a desire which moves to action is from the mind itself. We are thus introduced to contingency as a synonym of “spontaneity.”
Kuno Fischer calls attention to the fact that Spinoza and Leibniz both use the same sort of illustration to show the non-arbitrary character of human action, but the same illustration with a difference; and in the difference he finds the distinction between the two philosophies. Spinoza says that a stone falling to the ground, if endowed with consciousness, might imagine itself following its own will in falling. Leibniz says that a magnetic needle similarly endowed might imagine that it turned towards the north simply because it wished. Both examples are used to illustrate the folly of relying upon the immediate “testimony” of consciousness. But the example of Spinoza is that of an object, all whose movements are absolutely necessitated from without; the example of Leibniz is that of an object whose activity, though following law, and not caprice, is apparently initiated from within. Of course in reality the movements of the magnetic needle are just as much externally conditioned as those of the stone; but the appearance of self-action in the latter case may serve at least to exemplify what is meant by spontaneity as attributed to human action.
It must be noticed at the outset that spontaneity belongs to every simple substance. We have only to recall the doctrine of monads. These suffer nothing from without, all their activity is the expression, is the unfolding, of their own law. “By nature,” Leibniz says, “every simple substance has perceptions, and its individuality consists in the permanent law which forms the succession of its perceptions, that are born naturally one of another. Hence it is not necessary for it to receive any physical influence from without; and therefore the soul has in itself a perfect spontaneity in such a way that its actions depend only upon God and itself.” Or if we put the matter in its connection with his psychology rather than with his metaphysics, it is true that our actions are determined by our motives; but motives are not forces without the soul, they are forces of the soul. In acting according to motives the soul is simply acting according to its own laws. A desire is not an impulsion from an external cause; it is the expression of an inward tendency. To say that the soul acts from the strongest desire is simply to say, from this standpoint, that it manifests the most real part of itself, not that it obeys a foreign force. Impulses, desires, motives, are all psychical; they admit of no description or explanation except in their relation to the soul itself. Thus when Leibniz compares, as he often does, motives to weights acting upon a balance, we are to remember that the balance is not to be conceived as the soul, and the weights as energies outside it, but that this is only a way of picturing what is going