"Knowledge might be divided into three categories: First, there is theoretical knowledge. This includes all knowledge of which man is aware but which is accepted by him on the statements of other people, and by the specialists in the various branches of knowledge. It is founded on authoritative statements and has in it the element of trust in the writers and speakers, and in the trained intelligences of the workers in any of the many and varied fields of thought. The truths accepted as such have not been formulated or verified by the one who accepts them, lacking as he does the necessary training and equipment. The dicta of science, the theologies of religion, and the findings of the philosophers and thinkers everywhere colour the point of view and meet with a ready acquiescence from the untrained mind, and that is the average mind. p.15"