What is the author's tone in The Empty Space by Peter Brook?

The Empty Space is written with a barely restrained sense of passion for the subject, almost a desperation for a reader not only to accept the theories being presented, but to absorb them and adopt them as his or her own. It's an intriguing and effective blend of the subjective and the objective, in that the author seems determined to present rational, well researched and well considered arguments for his position, but can't help letting a pleading, personal quality seep into his words.