They said their product will be ready for shipment in two months and we could even "take that to the bank", but we’ve heard that before. Seeing is believing.
1712, Humphry Polesworth [pseudonym; John Arbuthnot], “How Lewis Baboon Came to Visit John Bull, and What Pass’d between Them”, in Lewis Baboon Turned Honest, and John Bull Politician. Being the Fourth Part of Law is a Bottomless-Pit.[…], London: […]John Morphew,[…], →OCLC, page 21:
There is nothing like Matter of Fact; Seeing is Believing.
1848, J. C., A. W. Hare, Guesses at Truth, second edition, page 497:
Seeing is believing, says the proverb. Though, of all our senses, the eyes are the most easily deceived, we believe them in preference to any other evidence.