In the case of occasional drunkenness, for instance, the habitual correlation is not of mind and strong drink, but of mind and considerations of honour, prudence, and virtue. But strong drink being associated on some occasion with objects which are correlated to the mind, as hospitality, friendship, or festive celebrations,—may obtain the mastery; and in this case, the individual being under no temptation from strong drink in itself considered, and being really affected with the sense of the most agreeable in relation to objects which are opposed to drunkenness, may take care that strong drink shall not come again into circumstances to give it an adventitious advantage. The repetition of occasional drunkenness would of course by and by produce a change in the sensitivity, and establish an habitual liking for drink. “On this account, the moral inability that attends fixed habits, especially obtains the name of inability. And then, as the will may remotely and indirectly resist itself, and do it in vain, in the case of strong habits; so reason may resist present acts of the will, and its resistance be insufficient: and this is more commonly the case, also, when the acts arise from strong habit.” (ibid.)

In every act of the will, the will at the moment is unable to act otherwise; it is in the strictest sense true, that a man, at the moment of his acting, must act as he does act; but as we usually characterize men by the habitual state of their minds, we more especially speak of moral inability in relation to acts which are known to have no correlation to this habitual state. This habitual state of the mind, if it be opposed to reason, overcomes reason; for nothing, not even reason itself, can be the strongest motive, unless it produce the sense of the most agreeable; and this it cannot do, where the habitual disposition or sensitivity is opposed to it.

Common usage with respect to the phrase want of power or inability to act in a certain way.

“But it must be observed concerning moral inability, in each kind of it, that the word inability is used in a sense very diverse from its original import. The word signifies only a natural inability, in the proper use of it; and is applied to such cases only wherein a present will or inclination to the thing, with respect to which a person is said to be unable, is supposable. It cannot be truly said, according to the ordinary use of language, that a malicious man, let him be never so malicious, cannot hold his hand from striking, or that he is not able to show his neighbour a kindness; or that a drunkard, let his appetite be never so strong, cannot keep the cup from his mouth. In the strictest propriety of speech, a man has a thing in his power if he has it in his choice or at his election; and a man cannot be truly said to be unable to do a thing, when he can do it if he will.” (ibid.)

Men, in the common use of language, and in the expression of their common and generally received sentiments, affirm that an individual has any thing in his power when it can be controlled by volition. Their connexion of power does not arise from the connexion of volition with its cause, but from the conception of volition as itself a cause with its effects. Thus the hand of a malicious man when moved to strike, having for its antecedent a volition; and if withheld from striking, having for its antecedent likewise a volition; according to the common usage of language, he, as the subject of volition, has the power to strike or not to strike. Now as it is “improperly said that he cannot perform those external voluntary actions which depend on the will, it is in some respects more improperly said, that he is unable to exert the acts of the will themselves; because it is more evidently false, with respect to these, that he cannot if he will; for to say so is a downright contradiction; it is to say he cannot will if he does will: and, in this case, not only is it true that it is easy for a man to do the thing if he will, but the very willing is the doing.” (ibid.)

It is improper, according to this, to say that a man cannot do a thing, when nothing is wanting but an act of volition; for that is within our power, as far as it can be within our power, which is within the reach of our volition.

It is still more improper to say that a man is unable to exert the acts of the will themselves, or unable to produce volitions. To say that a man has power to produce volitions, would imply that he has power to will volitions; but this would make one volition the cause of another, which is absurd. But, as it is absurd to represent the will as the cause of its own volitions, and of course to say that the man has ability to produce his volitions, it must be absurd likewise to represent the man as unable, in any particular case, to produce volitions, for this would imply that in other cases he is able. Nay, the very language is self-contradictory. If a man produce volitions, he must produce them by volitions; and if in any case he is affirmed to be unable to produce volitions; then this inability must arise from a want of connexion between the volition by which the required volition is aimed to be produced, and the required volition itself. So that to affirm that he is unable to will is equivalent to saying, that he cannot will if he will—a proposition which grants the very point it assumes to deny. “The very willing is the doing,” which is required.

Edwards adopts what he calls the “original” and “proper,” meaning of power, and ability, as applied to human agents, and appearing, “in the ordinary use of language,” as the legitimate and true meaning. In this use, power, as we have seen, relates only to the connexion of volition with its consequents, and not to its connexion with its antecedents or motives. Hence, in reference to the human agent, “to ascribe a non-performance to the want of power or ability,” or to the want of motives, (for this is plainly his meaning,) “is not just,” “because the thing wanting,” that is, immediately wanting, and wanting so far as the agent himself can be the subject of remark in respect of it, “is not a being able,” that is, a having the requisite motives, or the moral ability, “but a being willing, or the act of volition, itself. To the act of volition, or the fact of ‘being willing,’” there is no facility of mind or capacity of nature wanting, but only a disposition or state of mind adapted to the act; but with this, the individual can have no concern in reference to his action, because he has all the ability which can be predicated of him legitimately, when he can do the act, if he will to do it. It is evident that there may be an utter moral inability to do a thing—that is the motive may be wanting which causes the volition, which is the immediate antecedent of the thing to be done; but still if it is true that there is such a connexion between the volition and the thing to be done, that the moment the volition takes place the thing is done; then, according to Edwards, the man may be affirmed to be able to do it with the only ability that can be affirmed of him.

We can exert power only by exerting will, that is by putting forth volitions by choosing; of course we cannot exert power over those motives which are themselves the causes of our volitions. We are not unable to do anything in the proper and original and legitimate use of the word when, for the want of motive, we are not the subjects of the volition required as the immediate antecedent of the thing to be done; but we are unable in this use when, although the volition be made; still, through some impediment, the thing is not done. We are conscious of power, or of the want of power only in the connexion between our actual volitions and their objects.

“Sec. V. Concerning the Notion of Liberty, and of moral Agency.”