Man's mind stretched to a new idea, never goes back to it's original dimensions. An education isn't how much you have committed to memory, or even how much you know. It's being able to differentiate between what you know and what you don't. Imagination is more important than knowledge. Knowledge is limited.
Imagination encircles the world.
I hear and I forget. I see and I remember. The unexamined life is not worth living. You must be the change you wish to see in the world. The best exercise for the heart is reaching down and lifting people up.