"It is because Socialism knows and foresees that religious beliefs, whether one regards them, with Sergi, as pathological phenomena of human psychology, or as useless phenomena of moral incrustation, are destined to perish by atrophy with the extension of even elementary scientific culture. This is why Socialism does not feel the necessity of waging a special warfare against these religious beliefs which are destined to disappear. It has assumed this attitude, although it knows that the absence or the impairment of the belief in God is one of the most powerful factors for its extension, because the priests of all religions have been, throughout all the phases of history, the most potent allies of the ruling classes in keeping the masses pliant and submissive under the yoke by means of the enchantment of religion, just as the tamer keeps wild beasts submissive by the terrors of the cracks of his whip" (page 63). It is also well to remember that a prevalent animistic habit of thought in viewing the events of life, whether it take the form of a belief in luck, as in gamblers and sporting men, or the form of a belief in supernatural interposition in mundane affairs, as in the case of the devotees of the anthropomorphic cults, or merely the tendency to give a teleological interpretation to evolution, to attribute a meliorative trend to the cosmic process, as in Tennyson's "through the ages one increasing purpose runs," tends, by retarding the prompt perception of relations of material cause and effect, to lower the industrial efficiency of the community.[17] The socialist materialist can look forward with unruffled serenity to the passing of religion, since his very definition of religion as "a popular striving after the illusory happiness that corresponds with a social condition which needs such an illusion,"[18] implies that it cannot pass away till it has ceased to be needful to human happiness. From the point of view of this Socialist materialism, the monogamous family, the present economic unit of society, ceases to be a divine institution, and becomes the historical product of certain definite economic conditions. It is the form of the family peculiar to a society based on private property in the means of production, and the production of commodities for sale. It is not crystallized and permanent, but, like all other institutions, fluid and subject to change. With the change in its economic basis, the code of sexual morality and the monogamous family are sure to be modified; but, in the judgment of such socialists as Friedrich Engels and August Bebel, we shall probably remain monogamous, but monogamy will cease to be compulsorily permanent.[19]