The hypothesis that the desires impel the will to act, is inconsistent with observed facts. If this hypothesis were true, the phenomena of volition would be very different from what they are. A man may desire that it should rain, for example; he may have the most intense feeling on this subject imaginable, and there may be no counteracting desire or feeling whatever; now if desire ever impelled a man to volition, it would induce him, in such a case, to will that it should rain. But no man, in his senses, ever puts forth a volition to make it rain--and why? Just because he is a rational creature, and knows that his volition cannot produce any such effect. In the same manner, a man might wish to fly, or to do a thousand other things which are beyond his power; and yet not make the least effort to do so, not because he has no power to put forth such efforts, but because he does not choose to make a fool of himself: This shows that desire, feeling, &c., is merely one of the conditions necessary to volition, and not its producing cause. Again. It has been frequently observed, since the time of Butler, that our passive impressions often become weaker and weaker, while our active habits become stronger and stronger. Thus, the feeling of pity, by being frequently excited, may become less and less vivid, while the active habit of benevolence, by which it is supposed to be induced, becomes more and more energetic. That is to say, while the power, as it is called, or the causal influence, is gradually diminishing, the effect, which is supposed to flow from it, is becoming more and more conspicuous. And again, the feeling of pity is sometimes exceedingly strong; that is to say, exceedingly vivid and painful, while there is no act attending it. The passive impression or susceptibility is entirely dissociated, in many cases, from the acts of the will. The feeling often exists in all its _power_, and yet there is no act, and no disposition to act, on the part of the individual who is the subject of it. The cause operates, and yet the effect does not follow!