The idea of good and bad, generally accepted by common sense, may be stated as follows: 'An action is good when it promotes the interests of an individual or a family; better when it promotes those of a district or a country; best when it promotes those of the whole world. An action is bad when it inflicts injury on another individual or another family; worse when. it is prejudicial to a district or a country; worst when it brings harm on the whole world. Strictly speaking, an action is good when it promotes interests, material or spiritual, as intended by the actor in his motive; and it is bad when it injures interests, material or spiritual, as intended by the actor in his motive.'

According to this idea, generally accepted by common sense, human actions may be classified under four different heads: (1) Purely good actions; (2) partly good and partly bad actions; (3) neither good nor bad actions; (4) purely bad actions. First, purely good actions are those actions which subserve and never hinder human interests either material or spiritual, such as humanity and love of all beings. Secondly, partly good and partly bad actions are those actions which are both for and against human interests, such as narrow patriotism and prejudiced love. Thirdly, neither good nor bad actions are such actions as are neither for nor against human interests--for example, an unconscious act of a dreamer. Lastly, purely bad actions, which are absolutely against human interests, cannot be possible for man except suicide, because every action promotes more or less the interests, material or spiritual, of the individual agent or of someone else. Even such horrible crimes as homicide and parricide are intended to promote some interests, and carry out in some measure their aim when performed. It follows that man cannot be said to be good or bad in the strict sense of the terms as above defined, for there is no human being who does the first class of actions and nothing else, nor is there any mortal who does the fourth class of actions and nothing else. Man may be called good and bad, and at the same time be neither good nor bad, in that he always performs the second and the third class of actions. All this, nevertheless, is a more play of words. Thus we are driven to conclude that the common-sense view of human nature fails to grasp the real state of actual life.