will subvert the principle of a man's understanding and give him a determination to believe what is most contrary to custom and experience, 101. Moral evil (q.v.) 80. Moral science 30; inferior to mathematics, 48; sceptical objections to, 126-7. Moral evidence easily combined with natural, 70. Motion 50. Nature design in, 105 f. (v. _Providence_), and the course of our ideas, 44. State of, a philosophical fiction, 151, 151 n. Necessary connexion (v. _Cause_). Necessity two definitions of, 75. A. _and Liberty_, 62-81; the controversy is based on ambiguity, and all mankind have always been of the same opinion on this subject, 63; our idea of the necessity of matter arises solely from observed uniformity and consequent inference, circumstances which are allowed by all men to exist in respect of human action, 64; history and knowledge of human nature assume such uniformity, 65, which does not exclude variety due to education and progress, 66; irregular actions to be explained by secret operation of contrary causes, 67; the inconstancy of human action, its constant character, as of winds and weather, 68; we all acknowledge and draw inferences from the regular conjunction of motives and actions, 69; history, politics, and morals show this, and the possibility of combining moral and natural evidence shows that they have a common origin, 70; the reluctance to acknowledge the necessity of actions due to a lingering belief that we can see real connexion behind mere conjunction, 71; we should begin with the examination not of the soul and will but of brute matter, 72; the prevalence of the liberty doctrine due to a false sensation of liberty and a false experiment, 72 n; though this question is the most contentious of all, mankind has always agreed in the doctrine of liberty, if we mean by it that hypothetical liberty which consists in a power of acting or not acting according to the determinations of our will, and which can be ascribed to every one who is not a prisoner, 73; liberty when opposed to necessity, and not merely to constraint, is the same as chance, 74. B. _Both necessity and liberty are necessary to morality_, this doctrine of necessity only alters our view of matter and so is at least innocent, 75; rewards and punishments imply the uniform influence of motives, and connexion of character and action: if necessity be denied, a man may commit any crime and be no worse for it, 76; liberty also essential to morality, 77.