I've just been re-reading part of Macbeth and came across this passage with Macbeth talking to the Doctor about Lady Macbeth who is sleep walking ("Out damned spot!" etc) after the murder of Duncan. It seems Shakespeare (via the Doctor character) had more than a passing understanding of psychotherapy...
MACBETH
...How does your patient, doctor?
DOCTOR
Not so sick, my lord,
As she is troubled with thick coming fancies,
That keep her from her rest.
MACBETH
Cure her of that.
Canst thou not minister to a mind diseased,
Pluck from the memory a rooted sorrow,
Raze out the written troubles of the brain
And with some sweet oblivious antidote
Cleanse the stuff'd bosom of that perilous stuff
Which weighs upon the heart?
DOCTOR
Therein the patient
Must minister to himself.
MACBETH
Throw physic to the dogs; I'll none of it.
W.Shakespeare
Phil