Penelope:
Sectarian distinctions of class, race, gender ...
Innate hierarchy based upon dogmatic discrimination of perceived purity and impurity.
Mark (Eudaimonist):
Examples?
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In most cultures of the past, and some still in the current world, a woman is seen as "impure" when she is menstruating. For some of these cultures, the woman is impure only when she menstruates, but not in the in-between times. In other cultures, a woman is eternally tainted by this (superstitious) "impurity." She is blocked from certain activities of the culture - particularly certain high-level religious practices, which are reserved for "pure" males.
She is "impure" not due to her own bad behavior, but because she is seen as innately "impure."
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Racial half-breeds, in many cultures, are seen as "impure." Due only to race, not conduct. (And denied access to certain cultural and/or religious practices within the society.)
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In many cultures, only the aristocracy - because of their "good blood" - are "pure" enough to go on chivalric quests, or to give-away all they own, hit the road, and seek a religious truth.
Lower classes (due to their "low birth") are seen as too "impure" for the highest things.
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In some cultures, those born blind or deaf or crippled are considered cursed by their god. "Impure" due to the sin of one or both of their parents.
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In many cultures still, only virgin females are considered "pure" and marriageable.
A woman, spoiled by sexual contact, is "impure." (Even if raped. In some cultures, all married women are considered inherently "impure," due to sex. Even while their husband, despite sexual-activity, is irregardless still considered "pure.")
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You can't escape double-standards (historically) where "purity" is concerned.
And many of these double-standards still exist today.