Philosophical Works, v. 2 (of 4) / Including All the Essays, and Exhibiting the More Important Alterations and Corrections in the Successive Editions Published by the Author

by David Hume

OF LIBERTY AND NECESSITY.

We come now to explain the direct passions, or the impressions which arise immediately from good or evil, from pain or pleasure. Of this kind are, desire and aversion, grief and joy, hope and fear.

Of all the immediate effects of pain and pleasure, there is none more remarkable than the will; and though, properly speaking, it be not comprehended among the passions, yet, as the full understanding of its nature and properties is necessary to the explanation of them, we shall here make it the subject of our inquiry. I desire it may be observed, that, by the will, I mean nothing but the internal impression we feel, and are conscious of, when we knowingly give rise to any new motion of our body, or new perception of our mind. This impression, like the preceding ones of pride and humility, love and hatred, 'tis impossible to define, and needless to describe any farther; for which reason we shall cut off all those definitions and distinctions with which philosophers are wont to perplex rather than clear up this question; and entering at first upon the subject, shall examine that long-disputed question concerning liberty and necessity, which occurs so naturally in treating of the will.

'Tis universally acknowledged that the operations of external bodies are necessary; and that, in the communication of their motion, in their attraction, and mutual cohesion, there are not the least traces of indifference or liberty. Every object is determined by an absolute fate to a certain degree and direction of its motion, and can no more depart from that precise line in which it moves, than it can convert itself into an angel, or spirit, or any superior substance. The actions, therefore, of matter, are to be regarded as instances of necessary actions; and whatever is, in this respect, on the same footing with matter, must be acknowledged to be necessary. That we may know whether this be the case with the actions of the mind, we shall begin with examining matter, and considering on what the idea of a necessity in its operations are founded, and why we conclude one body or action to be the infallible cause of another.

It has been observed already, that in no single instance the ultimate connexion of any objects is discoverable either by our senses or reason, and that we can never penetrate so far into the essence and construction of bodies, as to perceive the principle on which their mutual influence depends. 'Tis their constant union alone with which we are acquainted; and 'tis from the constant union the necessity arises. If objects had not an uniform and regular conjunction with each other, we should never arrive at any idea of cause and effect; and even after all, the necessity which enters into that idea, is nothing but a determination of the mind to pass from one object to its usual attendant, and infer the existence of one from that of the other. Here then are two particulars which we are to consider as essential to necessity, viz. the constant union and the inference of the mind; and wherever we discover these, we must acknowledge a necessity. As the actions of matter have no necessity but what is derived from these circumstances, and it is not by any insight into the essence of bodies we discover their connexion, the absence of this insight, while the union and inference remain, will never, in any case, remove the necessity. 'Tis the observation of the union which produces the inference; for which reason it might be thought sufficient, if we prove a constant union in the actions of the mind, in order to establish the inference along with the necessity of these actions. But that I may bestow a greater force on my reasoning, I shall examine these particulars apart, and shall first prove from experience that our actions have a constant union with our motives, tempers, and circumstances, before I consider the inferences we draw from it.

To this end a very slight and general view of the common course of human affairs will be sufficient. There is no light in which we can take them that does not confirm this principle. Whether we consider mankind according to the difference of sexes, ages, governments, conditions, or methods of education; the same uniformity and regular operation of natural principles are discernible. Like causes still produce like effects; in the same manner as in the mutual action of the elements and powers of nature.

There are different trees which regularly produce fruit, whose relish is different from each other; and this regularity will be admitted as an instance of necessity and causes in external bodies. But are the products of Guienne and of Champagne more regularly different than the sentiments, actions, and passions of the two sexes, of which the one are distinguished by their force and maturity, the other by their delicacy and softness?

Are the changes of our body from infancy to old age more regular and certain than those of our mind and conduct? And would a man be more ridiculous, who would expect that an infant of four years old will raise a weight of three hundred pounds, than one who, from a person of the same age, would look for a philosophical reasoning, or a prudent and well concerted action?

We must certainly allow, that the cohesion of the parts of matter arises from natural and necessary principles, whatever difficulty we may find in explaining them: and for a like reason we must allow, that human society is founded on like principles; and our reason in the latter case is better than even that in the former; because we not only observe that men always seek society, but can also explain the principles on which this universal propensity is founded. For it is more certain that two flat pieces of marble will unite together, than two young savages of different sexes will copulate? Do the children arise from this copulation more uniformly, than does the parents' care for their safety and preservation? And after they have arrived at years of discretion by the care of their parents, are the inconveniences attending their separation more certain than their foresight of these inconveniences, and their care of avoiding them by a close union and confederacy?