Sigmund Freud wasn’t the first to seek causes for mental problems
in the mentality of the patient.
A book by Paracelsus pointed out that psychology affects physiology in 1567.
He coined the term libido for the motivation of the id,
that is, the unconscious mind. The id is a theoretical psychic
energy in Freud’s model of the mind, along with the ego
and the super-ego. None of these exist except in the
mind—forming a kind of zodiac of the psyche. Freud’s
theories had a huge influence on Western culture, but none of them
have been validated scientifically or in practice.
See also in The book of science:
Readings on wikipedia: