Authors:

The doctor should be opaque to his patients and, like a mirror, should show them nothing but what is shown to him.

Sigmund Freud, E. James Lieberman, Robert Kramer, Dr Gregory C Richter (2012). “The Letters of Sigmund Freud and Otto Rank: Inside Psychoanalysis”, p.153, JHU Press
The doctor should be opaque to his patients and, like a mirror, should show them nothing but what is shown to him.