Cor. V. It follows, from the account here given of the voluntary and semi-voluntary motions, that we must get every day voluntary and semi-voluntary powers, in respect of our ideas and affections. Now this consequence of the doctrine of association is also agreeable to the fact. Thus we have a voluntary power of attending to an idea for a short time, of recalling one, of recollecting a name, a fact, &c. a semi-voluntary one of quickening or restraining affections already in motion, and a most perfectly voluntary one of exciting moral motives, by reading, reflection, &c.
For the motions which are previous and subservient to the obtaining of pleasure, and the removal of pain, will be much more frequent, from the very instant of birth, than those which occasion pain. The number also of the first will be perpetually increasing, of the last decreasing. Both which positions may be evinced by the following arguments:
First, The pleasures are much more numerous than the pains. Hence the motions which are subservient to them are much more numerous also.
Secondly, The associated circumstances of the pleasures are many more in number than the pleasures themselves. But these circumstances, after a sufficient association, will be able to excite the motions subservient to the pleasures, as well as these themselves. And this will greatly augment the methods of obtaining pleasure.
Thirdly, It favours the position here advanced, that the motions subservient to pleasure are of a moderate nature; and therefore, that they can be excited with the more ease, both in an automatic and voluntary manner.
Fourthly, The pains, and consequently the motions subservient to them, are few, and of a violent nature. These motions are also various, and therefore cannot be united to objects and ideas with constancy and steadiness; and, which is most to be regarded, they end, at last, from the very make of the body, in that species of motion which contributes most to remove or assuage the pain. This species therefore, since it recurs the most frequently, and continues longest, must be confirmed by association, to the exclusion of the rest.
Cor. I. Many changes in the actions of young children, very difficult to be explained, according to the usual methods of considering human actions, appear to admit of a solution from this proposition. These changes are such as tend to the ease, convenience, pleasure, of the young child; and they are sufficiently observable in the transition of the originally automatic actions
