We all inherit a great deal of useless knowledge , and a great deal of misinformation and error ( maps that were formerly thought to be accurate ) .
There is always a portion of what we have been told that must be discarded .
We all inherit a great deal of useless knowledge , and a great deal of misinformation and error ( maps that were formerly thought to be accurate ) , so that there is always a portion of what we have been told that must be discarded .