The truth is incontrovertible,
malice may attack it, ignorance may deride it, but in the end; there it is.”
Winston Churchill
“What is this the sound and rumor? What is this that all men hear, Like the wind in hollow valleys when the storm is drawing near, Like the rolling of the ocean in the eventide of fear?
'Tis the people marching on”
William Morris
In other words
As we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns - the ones we don't know we don't know.
Donald Rumsfeld, United States Secretary of Defence