Socrates said that the only true wisdom was in knowing you know nothing, but it was Donald Rumsfeld, the former Defense Secretary who orchestrated the Iraq War, who said, “There are known knowns, things we know that we know; and there are known unknowns, things that we know we don’t know. But there are also unknown unknowns, things we do not know we don’t know.” https://medium.com/ellemeno/for-all-i-know-4eddb18ee30