" Nevertheless the ego, it appears, cannot be accused of inconsistency. Being of a peaceable disposition it would like to incorporate the symptom and make it part of itself. It is from the symptom itself that the trouble comes. For the symptom, being the true substitute for and derivative of the repressed impulse, carries on the role of the latter; it continually renews its demands for satisfaction and thus obliges the ego in its turn to give the signal of unpleasure and put itself in a posture of defence. "

― Sigmund Freud , Inhibitions, Symptoms and Anxiety