What appears later on in society in the shape of Gemeingeist, esprit de corps, 'group spirit', etc., does not belie its derivation from what was originally envy. No one must want to put himself forward, every one must be the same and have the same. Social justice means that we deny ourselves many things so that others may have to do without them as well, or, what is the same thing, may not be able to ask for them. This demand for equality is the root of social conscience and the sense of duty. It reveals itself unexpectedly in the syphilitic's dread of infecting other people, which
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