'I desire the reader to take notice that though I confess that this way removes all notions of a miraculous conduct, yet I do not retract what I have said formerly, that the system of occasional causes does not bring in God acting miraculously. (See M. Leibniz's article in Histoire des Ouvrages des Savants, July 1698.) I am as much persuaded as ever I was that an action cannot be said to be miraculous, unless God produces it as an exception to the general laws; and that everything of which he is immediately the author according to those laws is distinct from a miracle properly so called. But being willing to cut off from this dispute as many things as I possibly can, I consent it should be said that the surest way of removing all notions that include a miracle is to suppose that all created substances are actively the immediate causes of the effects of nature. I will therefore lay aside what I might reply to that part of M. Leibniz's answer.
'I will also omit all objections which are not more contrary to his opinion than to that of some other philosophers. I will not therefore propose the difficulties that may be raised against the supposition that a creature can receive from God the power of moving itself. They are strong and almost unanswerable, but M. Leibniz's system does not lie more open to them than that of the Aristotelians; nay, I do not know whether the Cartesians would presume to say that God cannot communicate to our souls a power of acting. If they say so, how can they own that Adam sinned? And if they dare not say so they weaken the arguments whereby they endeavour to prove that matter is not capable of any activity. Nor do I believe that it is more difficult for M. Leibniz than for the Cartesians or other philosophers, to free himself from the objection of a fatal mechanism which destroys human liberty. Wherefore, waiving this, I shall only speak of what is peculiar to the system of the pre-established harmony.
'I. My first observation shall be, that it raises the power and wisdom of the divine art above everything that can be conceived. Fancy to yourself a ship which, without having any sense or knowledge, and without being directed by any created or uncreated being, has the power of moving itself so seasonably as to have always the wind favourable, to avoid currents and rocks, to cast anchor where it ought to be done, and to retire into a harbour precisely when it is necessary. Suppose such a ship sails in that manner for several years successively, being always turned and situated as it ought to be, according to the several changes of the air and the different situations of seas and lands; you will acknowledge that God, notwithstanding his infinite power, cannot communicate such a faculty to a ship; or rather you will say that the nature of a ship is not capable of receiving it from God. And yet what M. Leibniz supposes about the machine of a human body is more admirable and more surprising than all this. Let us apply his system concerning the union of the soul with the body to the person of Julius Caesar.
'II. We must say according to this system that the body of Julius Caesar did so exercise its moving faculty that from its birth to its death it went through continual changes which did most exactly answer the perpetual changes of a certain soul which it did not know and which made no impression on it. We must say that the rule according to which that faculty of Caesar's body performed such actions was such, that he would have gone to the Senate upon such a day and at such an hour, that he would have spoken there such and such words, etc., though God had willed to annihilate his soul the next day after it was created. We must say that this moving power did change and modify itself exactly according to the volubility of the thoughts of that ambitious man, and that it was affected precisely in a certain manner rather than in another, because the soul of Caesar passed from a certain thought to another. Can a blind power modify itself so exactly by virtue of an impression communicated thirty or forty years before and never renewed since, but left to itself, without ever knowing what it is to do? Is not this much more incomprehensible than the navigation I spoke of in the foregoing paragraph?
'III. The difficulty will be greater still, if it be considered that the human machine contains an almost infinite number of organs, and that it is continually exposed to the shock of the bodies that surround it,[1] and which by an innumerable variety of shakings produce in it a thousand sorts of modifications. How is it possible to conceive that this pre-established harmony should never be disordered, but go on still during the longest life of a man, notwithstanding the infinite varieties of the reciprocal action of so many organs upon one another, which are surrounded on all sides with infinite corpuscles, sometimes hot and sometimes cold, sometimes dry and sometimes moist, and always acting, and pricking the nerves a thousand different ways? Suppose that the multiplicity of organs and of external agents be a necessary instrument of the almost infinite variety of changes in a human body: will that variety have the exactness here required? Will it never disturb the correspondence of those changes with the changes of the soul? This seems to be altogether impossible.
[1] 'According to M. Leibniz what is active in every substance ought to be reduced to a true unity. Since therefore the body of every man is composed of several substances, each of them ought to have a principle of action really distinct from the principle of each of the others. He will have the action of every principle to be spontaneous. Now this must vary the effects ad infinitum, and confound them. For the impression of the neighbouring bodies must needs put some constraint upon the natural spontaneity of every one of them.'
'IV. It is in vain to have recourse to the power of God, in order to maintain that brutes are mere machines; it is in vain to say that God was able to make machines so artfully contrived that the voice of a man, the reflected light of an object, etc., will strike them exactly where it is necessary, that they may move in a given manner. This supposition is rejected by everybody except some Cartesians; and no Cartesian would admit it if it were to be extended to man; that is, if anyone were to assert that God was able to form such bodies as would mechanically do whatever we see other men do. By denying this we do not pretend to limit the power and knowledge of God: we only mean that the nature of things does not permit that the faculties imparted to a creature should not be necessarily confined within certain bounds. The actions of creatures must be necessarily proportioned to their essential state, and performed according to the character belonging to each machine; for according to the maxim of the philosophers, whatever is received is proportionate to the capacity of the subject that receives it. We may therefore reject M. Leibniz's hypothesis as being impossible, since it is liable to greater difficulties than that of the Cartesians, which makes beasts to be mere machines. It puts a perpetual harmony between two beings, which do not act one upon another; whereas if servants were mere machines, and should punctually obey their masters' command, it could not be said that they do it without a real action of their masters upon them; for their masters would speak words and make signs which would really shake and move the organs of the servants.
'V. Now let us consider the soul of Julius Caesar, and we shall find the thing more impossible still. That soul was in the world without being exposed to the influence of any spirit. The power it received from God was the only principle of the actions it produced at every moment: and if those actions were different one from another, it was not because some of them were produced by the united influence of some springs which did not contribute to the production of others, for the soul of man is simple, indivisible and immaterial. M. Leibniz owns it; and if he did not acknowledge it, but if, on the contrary, he should suppose with most philosophers and some of the most excellent metaphysicians of our age (Mr. Locke, for instance) that a compound of several material parts placed and disposed in a certain manner, is capable of thinking, his hypothesis would appear to be on that very ground absolutely impossible, and I could refute it