Herein, then, lies the error of the necessitarian. He discovers from experience the connection between an act and a corresponding motion; and his instinctive belief in the uniformity of nature's sequences authorizes him to extend this connection to all sequences where the two terms are the same. That is to say, wherever he discovers a change in body, he is authorized to infer the existence of a prior act by which it was produced. But he does not confine himself to this sequence alone. He does not rest satisfied with the universal principle, that every change in body, or in that which is passive, must proceed from the prior action of something else. He makes a most unwarrantable extension of this principle. He supposes not only that every change in body, but also that every act of mind, must proceed from the prior action of something else. Thus he confounds passion and action. He takes it for granted that a volition is an _effect_--an effect in such a sense that it cannot proceed from the mind, unless it be produced by the prior act thereof. He asserts that "the mind cannot be the cause of such an effect," of a volition, "except by the preceding action of the mind." Thus, in rising from a single experience to a universal maxim, by virtue of our belief in the uniformity of nature's laws, he does not confine himself to the observed sequences; he does not keep his attention steadily fixed on a change in body as the consequent, and on an act as the invariable antecedent. On the contrary, from the exceedingly abstruse and subtle nature of the subject, as well as from the ambiguity of language, he treats a volition as a consequent, which implies the same kind of antecedent as does a change in body. Thus, by this unwarrantable extension or application of his principle, he confounds the _motion of body_ with the _action of spirit_; than which there could hardly be a more unphilosophical confusion of ideas. From the foregoing remarks, it will be perceived, as I have already said, that the question is not, _whether every effect must have a cause_. This is conceded. We do not give up "this great principle of common sense." We insist upon it as firmly as do our adversaries; and hence, we have as strong a foundation whereon to rest our belief in the being of a God. But the question is, _whether every cause is an effect?_ Or, in other words, whether an act of mind can exist without being produced by the prior action of something else; just as the motion of body is produced by the prior action of mind? We say that it can exist without any such producing cause.