I need your help. The abstruse nature of the subject requires not only concentrated reading, not alone clear understanding, but co-operation with the author. For that which could easily be made comprehensible by personal contact and demonstration, must of necessity depend on mere words and intellectual concepts. Many of the questions that may arise in your mind during or after reading of each chapter can best be answered through the practical application of the exercises prescribed herein. Unfortunately, there is no other way to co-operate: the technique of acting can never be properly understood without practicing it.
To the Actor Routledge. London and New York (2003)