Henry O

“Do you remember me telling you we are practicing non-verbal spells, Potter?"
"Yes," said Harry stiffly.
"Yes, sir."
"There's no need to call me "sir" Professor."
The words had escaped him before he knew what he was saying.”
― J.K. Rowling, Harry Potter and the Half-Blood Prince

“Those people who think they know everything are a great annoyance to those of us who do.”
― Isaac Asimov

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

“Violence is the last refuge of the incompetent.”
― Isaac Asimov, Foundation