"perennial philosophy" meaning in English

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          "ref": "2009, Karen Armstrong, The Case for God, Vintage, published 2010, page 16:",
          "text": "All ancient religion was based on what has been called the perennial philosophy, because it was present in some form in so many pre-modern cultures.",
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        "Synonym of philosophia perennis"
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          "word": "philosophia perennis"
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  "word": "perennial philosophy"
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          "word": "philosophia perennis"
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