Compassion may be called the fundamental of all good art because it alone can tell you what other beings feel and experience. Only compassion severs the bonds of your personal limitations, and gives you deep access into the inner life of the character you study, without which you cannot properly prepare it for the stage

The inner life of the [imagination], and not the personal and tiny experiential resources of the actor, should be elaborated on the stage and shown to the audience. This life is rich and revealing for the audience as well as for the actor himself.