This is another instance of applying to the will principles which were first obtained from the observation of physical causes, and which really belong to physical causes only. With respect to physical causes, _it is true_ that uniformity appears to be a characteristic of necessary causes, simply because physical causes are relatively necessary causes:--but with respect to the will, _it is not true_ that uniformity appears to be a characteristic of necessary cause, because the will is not a necessary cause. That uniformity therefore, as in the case of physical causes, seems to become a characteristic of necessary cause, does not arise from the nature of the idea of cause, but from the nature of the particular subject, viz., _physical_ cause. Uniformity in logical strictness, does not belong to cause at all, but to law or rule. Cause is simply efficiency or power: law or rule defines the direction, aims, and modes of power: cause explains the mere existence of phenomena: law explains their relations and characteristics: law is the thought and design of the reason. Now a cause may be so conditioned as to be incapable of acting except in obedience to law, and this is the case of all physical causes which act according to the law or design of infinite wisdom, and thus the uniformity which we are accustomed to attribute to these causes is not their own, but belongs to the law under which they necessarily act. But will is a cause which is not so conditioned as to be incapable of acting except in obedience to law; it can oppose itself to, and violate law, but still it is a cause in connexion with law, the law found in the reason and sensitivity, which law of course has the characteristic of uniformity. The law of the reason and pure sensitivity is uniform--it is the law of right. The law of a totally corrupted sensitivity is likewise a uniform law; it is the law of passion; a law to do whatever is most pleasing to the sensitivity; and every individual, whatever may be the degree of his corruption, forms for himself certain rules of conduct, and as the very idea of rule embraces uniformity, we expect in every individual more or less uniformity of conduct. Uniformity of physical causation, is nothing but the design of the supreme reason developed in phenomena of nature. Uniformity of volitions is nothing but the design of reason and pure sensitivity, or of corrupted passion developed in human conduct. The uniformity thus not being the characteristic of cause as such, cannot be the characteristic of necessary cause. The uniformity of causation, therefore, argues nothing respecting the nature of the cause; it may be a necessary cause or it may not. There is no difficulty at all in conceiving of uniformity in a free contingent will, because this will is related to uniform rules, which in the unity of the being we expect to be obeyed but which we also know do not necessitate obedience. In physical causes we have the uniformity of necessitated causes.