Knowing is not understanding. There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.
“There are only two lasting bequests we can hope to give our children. One of these is roots, the other, wings.”
“I have, for many years past, contemplated the noble races of red men who are now spread over these trackless forests and boundless prairies, melting away at the approach of civilization.”