To a large extent this distinction of two classes of impulses is justified. There seems no doubt that the social, and what are usually termed moral, feelings have a tendency to return into consciousness after any temporary depression or exclusion, which is not shared by some of the feelings with which they most commonly conflict. Other impulses, not usually classed as moral, no doubt share this characteristic of persistency or recurrence. "The wish for another man's property," says Darwin, "is as persistent a desire as any that can be named." The selfish feelings have obviously this persistent character. But an evolutionist may perhaps maintain that it is one of the defects of ordinary moral opinion that it depreciates the necessity and value for life of the selfish feelings, just because they are so strong as to stand in need of no encouragement. And it is not necessary that the evolutionist morality should agree at all points with ordinary moral opinion or moral intuition. It recognises, or ought to recognise the agency of immoral as well as moral forces, admitting that it is by the action of both of these that man as he is at present has been produced, although the principle of the survival of the fittest has tended, though by no means uniformly, towards the elimination of the immoral factor. We may admit, therefore, that there is a pressure on the will of the average individual towards certain kinds of conduct rather than others, or, put more precisely, that while all acts are performed in consequence of pressure on the will, the pressure towards certain kinds of acts is a permanent force which, although overcome for the time, always tends to reassert itself, while the tendency towards other acts inconsistent with these is more intermittent and variable, and does not reassert itself in the same way. But this subjective experience is so limited in accuracy and extent as to be an unfit test of morality. [Sidenote: is restricted to previous habits of acting,] [Sidenote: and cannot define nature of morality.]