Sigmund Freud,
Dream Psychology — Chapter 8. The Primary and Secondary Process-Regression
(1920)
“ If they have forced their way anywhere to our perception, we discover from the analysis of the symptom formed that these normal thoughts have been subjected to abnormal treatment and have been transformed into the symptom by means of condensation and compromise formation, through superficial associations, under cover of contradictions, and eventually over the road of regression. ”
