„The category of class was at first indistinct from the concept of the human group; it is the rhythm of social life which is at the basis of the category of time; the territory occupied by the society furnished the material for the category of space; it is the collective force which was the prototype of the concept of efficient force, an essential element in the category of causality.“

— Émile Durkheim

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„We cannot diminish the value of one category of human life — the unborn — without diminishing the value of all human life.“
— Ronald Reagan
„At the roots of all our judgments there are a certain number of essential ideas which dominate all our intellectual life; they are what philosophers since Aristotle have called the categories of the understanding: ideas of time, space, class, number, cause, substance, personality, etc. They correspond to the most universal properties of things. They are like the solid frame which encloses all thought: this does not seem to be able to liberate itself from them without destroying itself.“
— Émile Durkheim