But obviously we do not alter the relation, when we change the terms. If liberty lie in the stated antecedence of volition to effects, and if liberty is measured by the necessity of the relation, then when the antecedent is changed, the relation remaining the same, liberty must still be present. For example: when a volition to move the arm is followed by a motion of the arm, there is liberty; now let galvanism be substituted for the volition, and the effect as certainly takes place; and as freedom is doing as we please, or will, "without considering how this pleasure (or will) comes to be as it is;" that is, without taking its motive into the account. So likewise, freedom may be affirmed to be doing according to the galvanic impulse, "without considering how" that impulse "comes to be as it is." If we take any other instance of stated antecedence and sequence, the reasoning is the same. For example, a water wheel in relation to the mill-stone: when the wheel turns, the mill-stone moves. In this case freedom may be defined: the mill-stone moving according to the turn of the wheel, "without considering how" that turn of the wheel "comes to be as it is." In the case of human freedom, freedom is defined, doing according to our volitions, without considering how the volition comes to be as it is; doing "according to choice, without taking into the meaning of the word anything of the cause of that choice." (p. 39.) If it be said that in the case of volition, we have the man of whom to affirm freedom; but in the case of the wheel and mill-stone, we have nothing of which liberty can properly be affirmed. I reply, that liberty must be affirmed, and is properly affirmed, of that to which it really belongs; and hence as volition is supposed to belong to the spiritual essence, man; and this spiritual essence is pronounced free, because volition appears in it, and is attended by consequences:--so, likewise, the material essence of the wheel may be pronounced free, because motion belongs to it, and is followed by consequences. As every being that has volition is free, so likewise every thing that hath motion is free:--in every instance of cause and effect, we meet with liberty.