Just as they are not concerned with beliefs, they are also not concerned with intellectual theories, except in a purely secondary way. I do not like the word mystical, because it often has very, very weird connotations. I prefer something much more solid. The experience the Buddhists are concerned with, for instance, is very concrete. It is not anything abstract.
Abstractions belong to the realm of theory.
Instead, the transformation of consciousness that the Buddhists talk about is almost, you might say, a new way of using one's senses. Scientists are very often men of real faith. An honest scientist is a person who wants to know what this world really is. These codes are rather like a photograph of a person's face reproduced in a newspaper. Look closely at a newspaper reproduction of a person's face and you will see that it is composed of a lot of little dots.