One of the mysteries of the English language finally explained.
Agreements must be kept.
Mid 19th century. From classical Latin pacta, plural of pactum + sunt servanda ‘(they) must be kept’, after pacta et promissa semperne servanda sint whether agreements and promises should always be kept (Cicero De Officiis 3. 92); compare ideo servandum erit pactum conventum thus it will be necessary to keep the agreement made (Justinian Digest 2. 14. 13. 1).
pacta sunt servanda/ˈpaktə ˌsʊnt səːˈvandə/
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