Motives, as they are called, are different from each other in nature and in kind; and hence, it were absurd to compare them in degree. “The strongest motive,” therefore, is a mode of expression which can have no intelligible meaning, unless it be used with reference to the influence which motives are supposed to exert over the mind. This is the sense in which it clearly seems to be used by Edwards. The distinguishing property of a motive, according to his definition, is nothing in the nature of the motive itself; it consists in its adaptedness “to move or excite the mind to volition;” nor indeed could he find any other way of measuring or determining what he calls the strength of motives, since they are so diverse in their own nature from each other. He could not have given any plausible definition of the strength of motives, if he had looked at them as they are in themselves; and hence, he was under the necessity of defining it, by a reference to the “degree of tendency or advantage they have to move or excite the will.” Thus, according to the Inquiry, the will is determined by the strongest motive; and yet we can form no intelligible idea of what is meant by the strongest motive, unless we conceive it to be that which determines the will. The matter will not be mended, by alleging that the strongest motive is not defined to be that which actually determines the will, but that which has the greatest degree of previous tendency or advantage, to excite or move it; for we cannot know what motive has this greatest degree of previous tendency or advantage, except by observing what motive actually does determine the will.

This leads us to another view of the same subject. The strength of a motive, as President Edwards properly remarks, depends upon the state of the mind to which it is addressed. Hence, in a great majority of cases, we can know nothing about the relative strength of motives, except from the actual influence which they exert over the mind of the individual upon whom they are brought to bear. This shows that the universal proposition, that the will is always determined by the strongest motive, can be known to be true, only by assuming that the strongest motive is that by which the will is determined.

The same thing may be made to appear from another point of view. It has been well said by the philosopher of Malmsbury, “that experience concludeth nothing universally.” From experience we can pronounce, only in so far as we have observed, and no farther. But the proposition, that the will is always determined by the strongest motive, is a universal proposition; and hence, if true at all, its truth could not have been learnt from observation and experience. It must depend upon the very definition of the terms in which it is expressed. We cannot say that the will is in all cases determined by the strongest motive, unless we include in the very idea and definition of the strongest motive, that it is such that it determines the will. President Edwards not only does, but he must necessarily, go around in this circle, in order to give any degree of clearness and certainty to his doctrine.

That President Edwards goes around in this vicious circle, may be shown in another way. “It appears from these things,” says he, “that in some sense, the will always follows the last dictate of the understanding. But then the understanding must be taken in a large sense, as including the whole faculty of perception or apprehension, and not merely what is called reason or judgment. If by the last dictate of the understanding is meant what reason declares to be best, or most for the person’s happiness, taking in the whole of its duration, it is not true, that the will always follows the last dictate of the understanding,” p. 25. In this place, President Edwards gives no distinct idea of what he means by the last dictate of the understanding, which the will is said to follow in all cases. But in the eighth volume of his works, that dictate of the understanding which the will is said to follow, is called the “practical judgment;” and this is defined to be, “that judgment which men make of things that prevail, so as to determine their actions and govern their practice.” Here again are we informed, that the will always follows the practical judgment, and that the practical judgment is that which men make of things that prevail, so as to determine the will.

The Inquiry itself furnishes abundant evidence, that I have done its author no injustice. “I have chosen,” says he, “rather to express myself thus, that the will always is as the greatest apparent good, or as what appears most agreeable, than to say the will is determined by the greatest apparent good, or by what seems most agreeable; because an appearing most agreeable to the mind, and the mind’s preferring, seem scarcely distinct. If strict propriety of speech be insisted on, it may more properly be said, that the voluntary action, which is the immediate consequence of the mind’s choice, is determined by that which appears most agreeable, than the choice itself.” After all, then, it seems that choice itself, or volition, is not determined by that which appears the most agreeable; because, in reality, the sense of the most agreeable and volition are one and the same thing. But surely, if we cannot distinguish between choice and the sense of the most agreeable, then to say that the one always is as the other, is only to say that a thing is always as it is. Edwards saw the absurdity of saying that a thing is determined by itself; but he does not seem to have seen how insignificant is the proposition, that a thing is always as it is, and not otherwise; and hence this is the form in which he has chosen to present the great leading idea of his work on the will. And henceforth we are to understand, that the preference of the mind is always as that which appears most agreeable to the mind; or, in other words, that the preference or choice of the mind is always as the choice of the mind.

This is not all. President Edwards himself has frequently reduced the fundamental doctrine of the Inquiry to an identical proposition. It is well known, that “to be determined by the strongest motive,” “to follow the greatest apparent good,” “to do what is most agreeable,” or “what pleases most,” are all different modes of expression employed by him to set forth the same fundamental doctrine. In speaking of this doctrine, he says: “There is scarcely a plainer and more universal dictate of the sense and experience of mankind, than that, when men act voluntarily, and do what they please, then they do what suits them best, or what is most agreeable to them. To say, that they do what pleases them, but yet not what is agreeable to them, is the same thing as to say, they do what they please, but do not act their pleasure; and that is to say, that they do what they please, and yet do not what they please.” Most assuredly, if to deny the leading proposition of the Inquiry, is to deny that men do what they please when they do what they please; then to affirm it, is only to advance the insignificant truism, that men do what they please when they do what they please. It seems to me, that after President Edwards had reduced his fundamental proposition to such a truism, he might very well have spared himself the three hundred pages that follow.

Again, he says: “It is manifest that no acts of the will are contingent, in such sense as to be without all necessity, or so as not to be necessary with a necessity of consequence and connection; because every act of the will is some way connected with the understanding, and is as the greatest apparent good is, in the manner which has already been explained; namely, that the soul always wills or chooses that, which in the present view of the mind, considered in the whole of that view, and all that belongs to it, appears most agreeable. Because, as we observed before, nothing is more evident than that, when men act voluntarily, and do what they please, then they do what appears most agreeable to them; and to say otherwise would be as much as to affirm, that men do not choose what appears to suit them best, or what seems most pleasing to them; or that they do not choose what they prefer, which brings the matter to a contradiction.”

Thus, the great fundamental doctrine of the Inquiry is reduced by Edwards himself to the barren truism, that men do actually choose what they choose; a proposition which the boldest advocate of free-agency would hardly dare to call in question. After labouring through a whole section to establish this position, the author concludes by saying, “These things may serve, I hope, in some measure to illustrate and confirm the position laid down in the beginning of this section: viz. That the will is always determined by the strongest motive, or by the view of the mind which has the greatest previous tendency to excite volition. But whether I have been so happy as rightly to explain the thing wherein consists the strength of motives, or not, yet my failing in this will not overthrow the position itself; which carries much of its own evidence along with it, and is a point of chief importance to the purpose of the ensuing discourse: and the truth of it I hope will appear with great clearness, before I have finished what I have to say on the subject of human liberty.” Truly the position in question, as it is explained by the author himself, carries not only much, but all, of its own evidence along with it. Who can deny that a man always does what he pleases, when he does what he pleases? This truth appears with just as great clearness at the beginning, as it does at the conclusion, of the celebrated Inquiry of the author. It is invested in a flood of light, which can neither be increased by argument, nor obscured by sophistry.

From the foregoing remarks, it appears, I think, that the fundamental doctrine of the Inquiry is a barren truism, or a vicious circle. If Edwards understood the import of his own doctrine, when he reduced it to the form that a man does what he pleases when he does what he pleases, it is certainly a truism; and if this is all his famous doctrine amounts to, it can have no bearing whatever upon the question as to the cause of volition; for whether the mind be the cause of its own volitions, or whether the strongest motive always causes them, or whether they have no causes at all, it is equally and unalterably true, that every man does what he pleases when he does what he pleases. There is no possible form of the doctrine of free-agency or contingency, however wild, which is at all inconsistent with such a truism.

Edwards is not always consistent with himself. He sometimes represents the greatest apparent good, or sense of the most agreeable, as the cause of volition; and then his doctrine assumes the form, that the will is determined by the strongest motive, or the greatest apparent good. And yet he sometimes identifies a sense of the most agreeable with the choice itself; and then his doctrine assumes the form that the choice of the mind is always as the choice of the mind; and to deny it is a plain contradiction in terms.