fundamental point. Our theory plainly implied two things. It implied (1) that, if it is true at any one time that a particular voluntary action is right, it must always be true of that particular action that it was right: or, in other words, that an action cannot change from right to wrong, or from wrong to right; that it cannot possibly be true of the very same action that it is right at one time and wrong at another. And it implied also (2) that the same action cannot possibly at the same time be both right and wrong. It plainly implied both these two things because it asserted that a voluntary action can only be right, if it produces a maximum of pleasure, and can only be wrong, if it produces less than a maximum. And obviously, if it is once true of any action that it did produce a maximum of pleasure, it must always be true of it that it did; and obviously also it cannot be true at one and the same time of one and the same action both that it did produce a maximum of pleasure and also that it produced less than a maximum. Our theory implied, therefore, that any particular action cannot possibly
