If you can't explain it simply, you don't understand it well enough. Albert Einstein Inspirational Famous
When he to whom one speaks does not understand, and he who speaks himself does not understand, that is metaphysics. Voltaire
The beginning of knowledge is the discovery of something we do not understand. Frank Herbert Knowledge Discovery Beginning
The world doesn't understand me and I don't understand the world, that's why I've withdrawn from it. Paul Cezanne