where do these old sayings come from?

[bowwow]

Hind sight is 20/20.

 

[Phil96]

truer words were never spoken

 

[Busa1166]

Forinstace: "There's room enough in there to swing a cat".
Did somebody buy a house and discover there was indeed room to swing a cat.

This not an old saying it's actually a system of measurement I have used it myself a lot more fun than a tape measure