[A]s followers of natural science we know nothing of any relation between thoughts and the brain, except as a gross correlation in time and space. - Charles Scott Sherrington

Mind, for anything perception can compass, goes therefore in our spatial world more ghostly than a ghost. Invisible, intangible, it is a thing not even of outline; it is not a 'thing'. It remains without sensual confirmation, and remains without it for ever. All that counts in life. Desire, zest, truth, love, knowledge, 'values', and, seeking metaphor to eke out expression, hell's depth and heaven's utmost height. Naked mind.

In the training and in the exercise of medicine a remoteness abides between the field of neurology and that of mental health, psychiatry. It is sometimes blamed to prejudice on the part of the one side or the other. It is both more grave and less grave than that. It has a reasonable basis. It is rooted in the energy-mind problem. Physiology has not enough to offer about the brain in relation to the mind to lend the psychiatrist much help.

It is difficult to get a hearing from busy men for even a great new truth.