"Man is surely aware of many needs, but the needs he is aware of are not always his own. At the very root of this failure to recognize one's truly worthwhile needs lies man's ability to misunderstand and misidentify himself, i.e., to lose himself. Quite often man loses himself by identifying himself with the wrong image. Because of this misidentification, man adopts the wrong table of needs which he feels he must gratify. Man responds quickly to the pressure of certain needs, not knowing whose needs he is out to gratify. At this juncture, sin is born. What is the cause of sin, if not the diabolical habit of man to be mistaken about his own self?"
R. Joseph B. Soloveitchik, "Redemption, Prayer, Talmud Torah"