Motive is to voluntary action in the human mind what cause is to effect in the material universe. The word liberty, as applied to mind, is analogous to the word chance as applied to matter: they spring from an ignorance of the certainty of the conjunction of antecedents and consequents.

Every human being is irresistibly impelled to act precisely as he does act: in the eternity which preceded his birth a chain of causes was generated, which, operating under the name of motives, make it impossible that any thought of his mind, or any action of his life, should be otherwise than it is. Were the doctrine of Necessity false, the human mind would no longer be a legitimate object of science; from like causes it would be in vain that we should expect like effects; the strongest motive would no longer be paramount over the conduct; all knowledge would be vague and undeterminate; we could not predict with any certainty that we might not meet as an enemy to-morrow him with whom we have parted in friendship to-night; the most probable inducements and the clearest reasonings would lose the invariable influence they possess. The contrary of this is demonstrably the fact. Similar circumstances produce the same unvariable effects. The precise character and motives of any man on any occasion being given, the moral philosopher could predict his actions with as much certainty as the natural philosopher could predict the effects of the mixture of any particular chemical substances. Why is the aged husband-man more experienced than the young beginner? Because there is a uniform, undeniable necessity in the operations of the material universe. Why is the old statesman more skilful than the raw politician? Because, relying on the necessary conjunction of motive and action, he proceeds to produce moral effects, by the application of those moral causes which experience has shown to be effectual. Some actions may be found to which we can attach no motives, but these are the effects of causes with which we are unacquainted. Hence the relation which motive bears to voluntary action is that of cause to effect; nor, placed in this point of view, is it, or ever has it been, the subject of popular or philosophical dispute. None but the few fanatics who are engaged in the herculean task of reconciling the justice of their God with the misery of man, will longer outrage common sense by the supposition of an event without a cause, a voluntary action without a motive. History, politics, morals, criticism, all grounds of reasonings, all principles of science, alike assume the truth of the doctrine of Necessity. No farmer carrying his corn to market doubts the sale of it at the market price. The master of a manufactory no more doubts that he can purchase the human labour necessary for his purposes than that his machinery will act as they have been accustomed to act.

But, whilst none have scrupled to admit necessity as influencing matter, many have disputed its dominion over mind. Independently of its militating with the received ideas of the justice of God, it is by no means obvious to a superficial inquiry. When the mind observes its own operations, it feels no connection of motive and action: but as we know »nothing more of causation than the constant conjunction of objects and the consequent inference of one from the other, as we find that these two circumstances are universally allowed to have place in voluntary action, we may be easily led to own that they are subjected to the necessity common to all causes.« The actions of the will have a regular conjunction with circumstances and characters; motive is to voluntary action what cause is to effect. But the only idea we can form of causation is a constant conjunction of similar objects, and the consequent inference of one from the other: wherever this is the case necessity is clearly established.

The idea of liberty, applied metaphorically to the will, has sprung from a misconception of the meaning of the word power. What is power? – id quod potest, that which can produce any given effect. To deny power is to say that nothing can or has the power to be or act. In the only true sense of the word power, it applies with equal force to the lodestone as to the human will. Do you think these motives, which I shall present, are powerful enough to rouse him? is a question just as common as, Do you think this lever has the power of raising this weight? The advocates of free-will assert that the will has the power of refusing to be determined by the strongest motive: but the strongest motive is that which, overcoming all others, ultimately prevails; this assertion therefore amounts to a denial of the will being ultimately determined by that motive which does determine it, which is absurd. But it is equally certain that a man cannot resist the strongest motive as that he cannot overcome a physical impossibility.

The doctrine of Necessity tends to introduce a great change into the established notions of morality, and utterly to destroy religion. Reward and punishment must be considered, by the Necessarian, merely as motives which he would employ in order to procure the adoption or abandonment of any given line of conduct. Desert, in the present sense of the word, would no longer have any meaning; and he who should inflict pain upon another for no better reason than that he deserved it, would only gratify his revenge under pretence of satisfying justice. It is not enough, says the advocate of free-will, that a criminal should be prevented from a repetition of his crime: he should feel pain, and his torments, when justly inflicted, ought precisely to be proportioned to his fault. But utility is morality; that which is incapable of producing happiness is useless; and though the crime of Damiens must be condemned, yet the frightful torments which revenge, under the name of justice, inflicted on this unhappy man cannot be supposed to have augmented, even at the long run, the stock of pleasurable sensation in the world. At the same time, the doctrine of Necessity does not in the least diminish our disapprobation of vice. The conviction which all feel that a viper is a poisonous animal, and that a tiger is constrained, by the inevitable condition of his existence, to devour men, does not induce us to avoid them less sedulously, or, even more, to hesitate in destroying them: but he would surely be of a hard heart who, meeting with a serpent on a desert island, or in a situation where it was incapable of injury, should wantonly deprive it of existence. A Necessarian is inconsequent to his own principles if he indulges in hatred or contempt; the compassion which he feels for the criminal is unmixed with a desire of injuring him: he looks with an elevated and dreadless composure upon the links of the universal chain as they pass before his eyes; whilst cowardice, curiosity, and inconsistency only assail him in proportion to the feebleness and indistinctness with which he has perceived and rejected the delusions of free-will.

Religion is the perception of the relation in which we stand to the principle of the universe. But if the principle of the universe be not an organic being, the model and prototype of man, the relation between it and human beings is absolutely none.