The only defense against the world is a thorough knowledge of it.

Words were not given to man in order to conceal his thoughts.

"The greatest glory in living lies not in never falling, but in rising every time we fall."

The actor must be able to create a world and then live in it.

默记所学的东西，坚持学习而不厌烦，教诲别人不知疲倦。