on and on it goes.
it's a useful platatude within boundries of understanding but it's not a rule.
I often see 'a broken clock . . . right twice a day' but it's really supposed to be a 'stopped clock is right twice a day'.
as I said one could write a book about this.
the statement is useful within a certain context.
for one it's a great conversation starter to turn the discussion into a hardcore one about epistemology.