Through the course of this book, Dr. Lilly describes and explains his experiences, with and without drugs, which led to the formulation of the statement which is it's core: "In the province of the mind, what one believes to be true either is true or becomes true within limits to be found experimentally and experientially. These beliefs are limits to be transcended." One creates one's own truth and may or may not subject it to tests which may or may not confirm it, so that even one's objectivity is subjective. Awareness of this constant state of things allows one to observe one's own behavior, as well as that of others, with greater empathy and understanding of the process by which one chooses to believe