WE have now considered the class of sensations, called Pleasurable, and Painful. We have also considered the Ideas of those sensations, or that revival of them which is capable of taking place, when the outward action upon the senses is removed. The Idea of the pleasurable sensation, and the Desire of it; the Idea of the painful sensation, and the Aversion to it; are respectively names for one and the same state of consciousness.
We have also considered the Ideas of the Causes of our Pleasurable and Painful sensations. We have found that those Ideas are never Ideas of the Causes separately; but Ideas both of the causes and of their effects, inseparably joined by association. They are not, therefore, indifferent Ideas; they are always either pleasurable or painful; being complex Ideas, to a great degree composed of the Ideas of pleasurable and painful sensations.
As the simple Idea of a pleasurable or painful sensation, is a DESIRE or an AVERSION; so the complex Idea, composed of the Ideas of a Cause of pleasurable or painful sensations, and its effects, is called an 328 AFFECTION; which receives different names, according as it is modified by different circumstances; of time, for example, past or future; and if future, certainly or uncertainly, future.
We next observed, that our own acts were very often the cause of the causes of our pleasures, and of the prevention of our pains. The Idea of an action of our own, as cause, strongly associated with the Idea of a pleasure as its effect, we found to be a state of mind peculiarly important; because it excites to action. In what manner this state of mind gives birth to action, is the question which we now have to resolve.
The object of the Inquiry is, to find out, what that peculiar state of mind or consciousness is, by which action is preceded. From all men it receives the same name. It is called the Will, by every body; and by every body this Will is understood to be a state of mind or consciousness; but how formed, or wherein consisting, is variously and vehemently disputed.
Much of the confusion of Ideas which has darkened this controversy arose from the misconception, so long universal, respecting the Idea of a Cause. The will was invariably, and justly, assumed as the cause of the action; but unhappily there was always assumed as a part of the Idea of this cause, an item, which is found to be altogether imaginary. In the sequence of events called Cause and Effect, men were not contented with the Cause and the Effect; they imagined a third thing, called Force or Power, which was not the cause, but something emanating from the cause, and the true and immediate cause of the 329 Effect. This illusion has been minutely examined, as we have already [remarked], by a late Philosopher; by whom it has been proved, beyond the reach of contradiction, that the power of any cause is nothing different from the cause. A cause, and the power of a cause, are not two things, but two names for the same thing. With the Idea of Cause is always united the Idea of Effect. It is one of the cases of inseparable conjunction. The Idea of the Cause as existing, is irresistibly followed by the Idea of the Effect as existing. Not only does the one Idea always follow the other; but it is not in our power to prevent their following. Now the Idea of any thing as existing, when that idea forces itself upon us, and cannot be resisted, is that which we call Belief. In all this, however, there is nothing but the idea of an Antecedent and a Consequent, and a fixed order of Association. Our object, therefore, in this Inquiry will be completely attained if we discover which is the real state of mind which immediately precedes an action.
The actions of a human being may be divided into two sorts: I. Those which are called the actions of his Body; II. Those which are called the actions of his mind. We shall endeavour to ascertain what are the antecedents of both, and shall begin with the Body.
I. The actions of the Body are all of one sort. They consist essentially of that action of certain fibres, which is called contraction. The object of this part of our Inquiry, therefore, is to ascertain what are the states of mind which immediately precede a fibrous contraction.
330 We can show that muscular or fibrous contractions follow, 1st, Sensations; 2dly, Ideas: and we can also shew, that in a vast proportion of those cases, the sequence is invariable; in other words, that the Sensation, or Idea, is the cause of the contraction.
1. It is no part of our present business to adduce what has been discovered by physiologists in tracing the physical antecedents of a contracting muscle. The mental antecedent is the object of our inquiry; and whether a physical link, or more than one physical link, intervenes between it and the contraction, alters not the question as to the state of the mental cause; nor the fact as to the ultimate effect. Facts are abundant, to prove, that the nerves are the immediate instrument of contraction; and also that the effect produced by the mental state is first upon the nerves, and only through the nerves upon the muscle. A paralytic limb, is a limb, the movement of which is not consequent upon that mental state which is usually followed by such a movement. But a paralytic limb is only a limb, the nerves of which are deprived of their usual power by a disorder in that part of the brain in which they originate.