Worldviews include within them accounts of alien worldviews held by others. These accounts sometimes also include reasons for why these alien worldviews are invalid and do not require consideration and understanding.

Such invalidating accounts protect one’s worldview from the consequences of understanding rival worldviews and experiencing their validity. It is as if worldviews have life of their own that they preserve as biological organisms do, protecting their outer skin, taking in only that which it can digest and incorporate and repelling everything else.

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Monism, the belief that there is a singular and ultimate truth to be found, inclines people to assume that if something appears self-evidently true, that whatever appears to conflict with it is necessarily false. It is the casual and mostly unconscious tendency of people who have never experienced a shift in worldviews. But those who have experienced a single shift are the fiercest adherents of monism, because they’ve experienced this shift as a conversion from a world of illusion to one of overwhelming truth, which is taken as a discovery of the true world. This discovery is not experienced as the acquisition of new facts about the world, but as a transfiguration of the world itself. The experience is so deep and so dramatic (and pleasant) that is often fails to occur to the convert that the process could occur again, re-transfiguring the transfigured, so the convert fails to look for clues that this is the case. If it does, another conversion is likely to occur: from monism to pluralism.

Pluralism lives on practical terms with the properties of worldviews — the fact that they have “horizons” of intelligibility (which can be characterized as the set of questions the worldview knows how to ask), that they project specific patterns of relevance and irrelevance onto phenomena and fact, that the perspective by which the worldview sees always appears absolute and self-evidently right, and most importantly that worldviews naturally and perhaps inevitably generate misunderstandings which can only be detected with effort.

Consequently, a pluralist always harbors a certain amount of suspicion even toward pluralism, which inclines a pluralist to respect even monistic views, and to attempt to learn from them. But again, pluralism is practical, which means it lives on terms with reality as it experiences it, with the understanding that the surprise of transcendence is a permanent possibility, and that there is no way to predict when such events will occur and what will result from them. Pluralism, unlike skepticism, doesn’t throw up its hands, saying “what can I know?” It doesn’t think of learning as a means to the end of final knowledge. (Arendt identified orientation toward means-and-ends as belonging to the middle stratum of active life, which she called “work”, whose primary activity is the fabrication of artifacts. The stratum above work is “action”, the realm of politics which both presupposes and preserves pluralistic conditions. See Arendt quote below.) What matters, rather, is the desire for particular kinds of knowledge, which signals the next intellectual development, both for individuals and groups of people.

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Arendt, from The Human Condition:

With the term vita activa, I propose to designate three fundamental human activities: labor, work, and action. They are fundamental because each corresponds to one of the basic conditions under which life on earth has been given to man.

Labor is the activity which corresponds to the biological process of the human body, whose spontaneous growth, metabolism, and eventual decay are bound to the vital necessities produced and fed into the life process by labor. The human condition of labor is life itself.

Work is the activity which corresponds to the unnaturalness of human existence, which is not imbedded in, and whose mortality is not compensated by, the species’ ever-recurring life cycle. Work provides an “artificial” world of things, distinctly different from all natural surroundings. Within its borders each individual life is housed, while this world itself is meant to outlast and transcend them all. The human condition of work is worldliness.

Action, the only activity that goes on directly between men without the intermediary of things or matter, corresponds to the human condition of plurality, to the fact that men, not Man, live on the earth and inhabit the world. While all aspects of the human condition are somehow related to politics, this plurality is specifically the condition — not only the conditio sine qua non, but the conditio per quam — of all political life. … Action would be an unnecessary luxury, a capricious interference with general laws of behavior, if men were endlessly reproducible repetitions of the same model, whose nature or essence was the same for all and as predictable as the nature or essence of any other thing. Plurality is the condition of human action because we are all the same, that is, human, in such a way that nobody is ever the same as anyone else who ever lived, lives, or will live.

All three activities and their corresponding conditions are intimately connected with the most general condition of human existence: birth and death, natality and mortality. Labor assures not only individual survival, but the life of the species. Work and its product, the human artifact, bestow a measure of permanence and durability upon the futility of mortal life and the fleeting character of human time. Action, in so far as it engages in founding and preserving political bodies, creates the condition for remembrance, that is, for history. Labor and work, as well as action, are also rooted in natality in so far as they have the task to provide and preserve the world for, to foresee and reckon with, the constant influx of newcomers who are born into the world as strangers. However, of the three, action has the closest connection with the human condition of natality; the new beginning inherent in birth can make itself felt in the world only because the newcomer possesses the capacity of beginning something anew, that is, of acting. In this sense of initiative, an element of action, and therefore of natality, is inherent in all human activities. Moreover, since action is the political activity par excellence, natality, and not mortality, may be the central category of political, as distinguished from metaphysical, thought.