seeing is believing
- visible facts can't be denied
Wiktionary
proverb
- One needs to see something in order to believe it; visible facts cannot be denied.
“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.”
“There is nothing like Matter of Fact; Seeing is Believing.”
- One is skeptical regarding a claim.