impenetrabilis

See: impervious
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Nam unigenitus Dei filius, quem ignores, murus est mihi impenetrabilis et custos mihi est numquam dormiens et defensor mihi est numquam deficiens.
Etymology: From Latin impenetrabilis (impenetrable), referring to the firm soil layer covering the body of all specimens examined.
The sources of this dynamistical concept of impenetrability may be found in Leibniz's Specimen dynamicum (part 1, [section] 1) and in Baumgarten's Metaphysica, the textbook Kant used for his lectures: "Substantia, in cuius loco nequit esse alia extra earn posita, est impenetrabilis (solida)"; Metaphysica, [section] 398.