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Discover LudwigThe phrase "a sure proof of" is not correct in standard written English.
The correct expression would be "a sure sign of" or "a sure indication of."
Example: "The sudden drop in temperature is a sure sign of the approaching winter."
Alternatives: "a clear indication of" or "a definite sign of."
Exact(3)
Indeed, if the Isle of Man is anything to go by, one could say that it's a sure proof of sanity.
A sure proof of this was that I was never anxious about what those dreams would have involved if they had been true.
Google actually celebrates its hiring process, as if its ruthless inefficiency and interminable duration were a sure proof of thoroughness, a badge of honor.
Similar(57)
As a matter of fact, a concrete, sure proof of Averroes' influence on Maimonides' philosophical thought has not yet been found; but this does not exclude that he really knew well Averroes' philosophy.
A sure proof that Russia is listenin.
In April, the Federal Reserve Bank of St. Louis reported that the market had attained its highest price-to-earnings ratio in 100 years, sure proof of speculative excess.
At United breezeblock-footed simian Wayne Rooney filled the Uruguayan's position in attack, sure proof of the laughableness of the Premier League's claim to be the best on the planet.
It is the only sure proof of insurance no matter what is written on the truck!
But conversely, into a highly public forum -- a museum -- come these gentle but sure proofs of privacy.
(If the cartoon character Calvin is right, the surest proof of intelligent life in the universe is that it has not tried to contact us).
A look at the list of the top executives at young Israeli technology companies is the surest proof of the connection.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com