Perpetua lex est

Perpetua lex est, nullam legem humanum ac positivam perpetuam esse; et clausula quae abrogationem excludit initio non valet. It is a perpetual law that no human or positive law can be perpetual; and a clause in a law which precludes the power of abrogation is void ab initio. Bacon's Max. in Reg. 19.

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