A quotation from Cicero, Marcus Tullius:
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Law is the highest reason, rooted in nature, which commands things that must be done and prohibits the opposite.
[Lex est ratio summa, insita in natura, quae iubet ea quae facienda sunt, prohibetque contraria.]
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Full quote, sourcing, notes:
https://wist.info/cicero-marcus-tullius/58759/