 This discussion is about lying not deception. One can deceive without lying, e.g. by asserting something which you believe true but from which you know that the hearer will infer something false.  Or by not asserting at all as when a husband replaces his sleeping pills with cough medicine to prevent his wife from harming herself.  By a lie I mean an assertion P by A who does not believe that P and intends a listener to either come to believe that P or at least to believe that A believes that P.