Einstein said this: "" If you can't write about a subject, in a simple way, it's because, in fact, you don't understand it. "" So, if you... (Applause) To Einstein... (Applause) To Einstein... (Applause) So — ah, ah, I don't have time! — so, if you do know what you want to say — don't you? — you are aware of what you want to say, you just have to do one thing: believe that it is possible to write in a simple way.