" But a normal ego of this sort is, like normality in general, an ideal fiction. The abnormal ego, which is unserviceable for our purposes, is unfortunately no fiction. Every normal person, in fact, is only normal on the average. His ego approximates to that of the psychotic in some part or other and to a greater or lesser extent; and the degree of its remoteness from one end of the series and of its proximity to the other will furnish us with a provisional measure of what we have so indefinitely termed an 'alteration of the ego'. "

― Sigmund Freud