III. We are now prepared for a distinct statement of the doctrine of Ability, according to the Necessitarian scheme. Even the Necessitarians, with very few exceptions, admit, that in the absence of all power to do right or wrong, we can be under no obligation to do the one or avoid the other. "A man," says Pres. Day, "is not responsible for remaining in his place if he has no power to move. He is not culpable for omitting to walk, if he has no strength to walk. He is not under obligation to do anything for which he has not what Edwards calls _natural_ power." It is very important for us to understand the _nature_ of this ability, which lies at the foundation of moral obligation; to understand, I repeat, what this Ability is, according to the theory under consideration. This Ability, according to the doctrine of Liberty, has been well stated by Cousin, to wit: "The moment we take the resolution to do an action, we take it with a consciousness of being able to take a contrary resolution;" and by Dr. Dwight, who says of a man's sin, that it is "chosen by him unnecessarily, _while possessed of a power to choose otherwise_." The nature of this Ability, according to the Necessitarian scheme, has been stated with equal distinctness in the Christian Spectator. "If we take this term [Ability or Power] in the absolute sense, as including _all_ the antecedents to a given volition, there is plainly no such thing as power to the contrary; for in this sense of the term," as President Day states, "a man never has power to do anything but what he actually performs." "In this comprehensive, though rather unusual sense of the word," says President Day, "a man has not power to do anything which he does not do." The meaning of the above extracts cannot be mistaken. Nor can any one deny that they contain a true exposition of the doctrine of Necessity, to wit: that under the influences under which men do will, and consequently act, it is absolutely impossible for them to will and act differently from what they do. In what sense, then, have they power to will and act differently according to this doctrine? To this question President Day has given a correct and definite answer. "The man who wills in a particular way, under the influence of particular feelings, might will differently under a different influence."