= Isn't So =
-----
It isn't what we don't know that gives us trouble, it's what we know that ain't so.
[[https://www.brainyquote.com/quotes/quotes/w/willrogers385286.html | -  Will Rogers]]

It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.
[[https://www.brainyquote.com/quotes/quotes/m/marktwain109624.html | - Mark Twain]]

I honestly believe it is better to know nothing than to know what ain't so.
[[https://en.wikiquote.org/wiki/Josh_Billings | - Josh Billings, 1874 ]]

And how is not this the most reprehensible ignorance, to think that one knows what one does not know.
[[https://en.wikiquote.org/wiki/Socrates | - Socrates, "Plato" ]] 

I appear to be wiser than he, because I do not fancy I know what I do not know
[[https://en.wikiquote.org/wiki/Socrates | - Socrates, "Apology" ]]