As a prelude to the lesson, I began by calling a student volunteer to the front of the room. As it happened, it turned out to be the tallest student in the class. I asked him to show how high he could reach. He went over to the wall and rested his verrry long arm at a very tall spot on the wall.
Then when it appeared he had reached as high as he could, I asked him to reach a little higher. Invariably, even though the student thought he was reaching as tall as he could, he still was able to stretch more - even without standing on his toes!
A few years back, President Hinckley asked that we all reach a little higher, to do a little more. Not a lot more, just a little more. I shared this with the class and asked why President Hinckley asked this of us.