The character has to have some kind of arch. The character has to go through an event, and be changed by the human event.

All action in theatre must have inner justification, be logical, coherent, and real.

In talking about a genius, you would not say that he lies; he sees realities with different eyes from ours.

When you're playing a character who's cruel, look for the places where he's kind. When you're playing a character who is unhappy, look for the places where he has a glint of merriment.

The actor must use his imagination to be able to answer all questions (when, where, why, how). Make the make-believer existence more definite.

The life of a character should be an unbroken line of events and emotions, but a play only gives us a few moments on that line - we must create the rest to portray a convincing life.

Who am I? What will I be? Why am I here? Where am I going?