The science of human nature… finds itself today in the position that chemistry occupied in the days of alchemy.” Alfred Adler - Tom Butler-Bowdon

In short, every child develops in ways that best allow them to compensate for weakness;

The ego continually endeavors to create harmony between itself, the unconscious, and the outside world, but this does not always lead to perfect mental health. In fact, sometimes when the ego “wins” the person as a whole may have lost, since the win may involve the creation of a defense in order to have the ego maintain its sense of itself at all costs.

The ego develops a defense in order to protect itself against being overcome by unconscious demands such as sex and aggression. The work of the psychoanalyst is to get the person to become conscious of their instinctual urges, which may involve isolating the pain experienced when they were originally confronted by an unsatisfied impulse.