"Dictum meum pactum" — my word is my bond — has been the London Stock Exchange motto since 1801. I changed one word.
Pactum becomes solidus: the Roman gold coin whose weight and purity held steady for nearly seven centuries, outlasting the empire that struck it. Soldier derives from it. So does solid.
A pact can be broken. A solidus is weighed.
Dictum meum solidus meus — my word, my solidus. Not a sentiment to be trusted on faith, but a unit of value: testable, measurable, exchangeable. The engagements I take follow the same principle. Short, sharp, verifiable on delivery.