Editors’ note: Insincerity is self-deception. It stems from selfishness and the body’s domination of the real self. An insincere person will live more in the ego, and the conscience will not have much opportunity to assert itself. Most people have insincerity to some degree and you have to struggle against it whenever you see it, because it will block development if you let it get away with you. Unless a person is sincere it is impossible for him to become impartial either to himself or those about him. While insincerity is one of the twelve chief features, it is not a common one; anyone with this chief feature would be a pathological liar.