Quotation zu Tehillim 81:23

Among them, turning (excessively) to the physical pleasures. This is subtle association - that a man associates the service of his lusts with the service of the Creator. And the verse says: "There shall not be in you a strange god", to which our Rabbis expound: "what is the 'strange god' which is in the body of a man? - This is the evil inclination" (Talmud Shabbos 105b).