I haven’t read much John Maxwell, but I am intrigued by the subject of thinking, so I recently picked up his book How Successful People Think. Here are two good quotes:
“Nothing is so embarrassing as watching someone do something that you said could not be done” — Sam Ewing.
“Never tell a young person that something cannot be done. God may have been waiting for centuries for somebody ignorant enough of the impossible to do that thing” — John Andrew Holmes.