" In the province of the mind, what one believes to be true, either is true or becomes true within certain limits. These limits are to be found experientially and experimentally. When the limits are determined, it is found that they are further beliefs to be transcended. In the province of the mind, there are no limits. The body imposes definite limits. "

― John C. Lilly , The Deep Self: Consciousness Exploration in the Isolation Tank