§349These considerations make it plain that the laws of Nature regulating movements are neither entirely necessary nor entirely arbitrary. The middle course to be taken is that they are a choice of the most perfect wisdom. And this great example of the laws of motion shows with the utmost clarity how much difference there is between these three cases, to wit, firstly an absolute necessity, metaphysical or geometrical, which may be called blind, and which does not depend upon any but efficient causes; in the second place, a moral necessity, which comes from the free choice of wisdom in relation to final causes; and finally in the third place, something absolutely arbitrary, depending upon an indifference of equipoise, which is imagined, but which cannot exist, where there is no sufficient reason either in the efficient or in the final cause. Consequently one must conclude how mistaken it is to confuse either that which is absolutely necessary with that which is determined by the reason of the best, or the freedom that is determined by reason with a vague indifference.

§350This also settles M. Bayle's difficulty, for he fears that, if God is always determinate, Nature could dispense with him and bring about that same effect which is attributed to him, through the necessity of the order of things. That would be true if the laws of motion for instance, and all the rest, had their source in a geometrical necessity of efficient causes; but in the last analysis one is obliged to resort to something depending upon final causes and upon what is fitting. This also utterly destroys the most plausible reasoning of the Naturalists. Dr. Johann Joachim Becher, a German physician, well known for his books on chemistry, had composed a prayer which looked like getting him into trouble. It began: 'O sancta[335] mater natura, aeterne rerum ordo'. And it ended by saying that this Nature must forgive him his errors, since she herself was their cause. But the nature of things, if taken as without intelligence and without choice, has in it nothing sufficiently determinant. Herr Becher did not sufficiently take into account that the Author of things (natura naturans) must be good and wise, and that we can be evil without complicity on his part in our acts of wickedness. When a wicked man exists, God must have found in the region of possibles the idea of such a man forming part of that sequence of things, the choice of which was demanded by the greatest perfection of the universe, and in which errors and sins are not only punished but even repaired to greater advantage, so that they contribute to the greatest good.

§351M. Bayle, however, has extended the free choice of God a little too far. Speaking of the Peripatetic Strato (Reply to the Questions of a Provincial, vol. III, ch. 180, p. 1239), who asserted that everything had been brought forth by the necessity of a nature devoid of intelligence, he maintains that this philosopher, on being asked why a tree has not the power to form bones and veins, might have asked in his turn: Why has matter precisely three dimensions? why should not two have sufficed for it? why has it not four? 'If one had answered that there can be neither more nor less than three dimensions he would have demanded the cause of this impossibility.' These words lead one to believe that M. Bayle suspected that the number of the dimensions of matter depended upon God's choice, even as it depended upon him to cause or not to cause trees to produce animals. Indeed, how do we know whether there are not planetary globes or earths situated in some more remote place in the universe where the fable of the Barnacle-geese of Scotland (birds that were said to be born of trees) proves true, and even whether there are not countries where one could say:

... populos umbrosa creavit Fraxinus, et foeta viridis puer excidit alno?

But with the dimensions of matter it is not thus: the ternary number is determined for it not by the reason of the best, but by a geometrical necessity, because the geometricians have been able to prove that there are only three straight lines perpendicular to one another which can intersect at one and the same point. Nothing more appropriate could have been [336] chosen to show the difference there is between the moral necessity that accounts for the choice of wisdom and the brute necessity of Strato and the adherents of Spinoza, who deny to God understanding and will, than a consideration of the difference existing between the reason for the laws of motion and the reason for the ternary number of the dimensions: for the first lies in the choice of the best and the second in a geometrical and blind necessity.

§352Having spoken of the laws of bodies, that is, of the rules of motion, let us come to the laws of the union between body and soul, where M. Bayle believes that he finds again some vague indifference, something absolutely arbitrary. Here is the way he speaks of it in his Reply (vol. II, ch. 84, p. 163): 'It is a puzzling question whether bodies have some natural property of doing harm or good to man's soul. If one answers yes, one plunges into an insane labyrinth: for, as man's soul is an immaterial substance, one will be bound to say that the local movement of certain bodies is an efficient cause of the thoughts in a mind, a statement contrary to the most obvious notions that philosophy imparts to us. If one answers no, one will be constrained to admit that the influence of our organs upon our thoughts depends neither upon the internal qualities of matter, nor upon the laws of motion, but upon an arbitrary institution of the creator. One must then admit that it depended altogether upon God's freedom to combine particular thoughts of our soul with particular modifications of our body, even when he had once established all the laws for the action of bodies one upon another. Whence it results that there is in the universe no portion of matter which by its proximity can harm us, save when God wills it; and consequently, that the earth is as capable as any other place of being the abode of the happy man.... In short it is evident that there is no need, in order to prevent the wrong choices of freedom, to transport man outside the earth. God could do on earth with regard to all the acts of the will what he does in respect of the good works of the predestined when he settles their outcome, whether by efficacious or by sufficient grace: and that grace, without in any way impairing freedom, is always followed by the assent of the soul. It would be as easy for him on earth as in heaven to bring about the determination of our souls to a good choice.'

§353I agree with M. Bayle that God could have so ordered bodies and [337] souls on this globe of earth, whether by ways of nature or by extraordinary graces, that it would have been a perpetual paradise and a foretaste of the celestial state of the blessed. There is no reason why there should not be worlds happier than ours; but God had good reasons for willing that ours should be such as it is. Nevertheless, in order to prove that a better state would have been possible here, M. Bayle had no need to resort to the system of occasional causes: it abounds in miracles and in hypotheses for which their very originators confess there is no justification; and these are two defects such as will most of all estrange a system from true philosophy. It is a cause for surprise, in the first place, that M. Bayle did not bethink himself of the System of Pre-established Harmony which he had examined before, and which for this matter was so opportune. But as in this system all is connected and harmonious, all following from reasons and nothing being left incomplete or exposed to the rash discretion of perfect indifference, it seems that it was not pleasing to M. Bayle: for he was here somewhat biassed in favour of such indifference, which, notwithstanding, he contested so strongly on other occasions. He was much given to passing from one extreme to the other, not with an ill intention or against his own conviction, but because there was as yet nothing settled in his mind on the question concerned. He contented himself with whatever suited him for frustrating the opponent he had in mind, his aim being only to perplex philosophers, and show the weakness of our reason; and never, in my opinion, did either Arcesilaus or Carneades argue for and against with more eloquence and more wit. But, after all, one must not doubt for the sake of doubting: doubts must serve us as a gangway to the truth. That is what I often said to the late Abbe Foucher, a few specimens of whose work prove that he designed to do with regard to the Academicians what Lipsius and Scioppius had done for the Stoics, and M. Gassendi for Epicurus, and what M. Dacier has so well begun for Plato. It must not be possible for us to offer true philosophers such a reproach as that implied in the celebrated Casaubon's answer to those who, in showing him the hall of the Sorbonne, told him that debate had been carried on there for some centuries. What conclusions have been reached? he said to them.