Freud considered it unscientific to believe in freedom of will. But the normal ego senses such freedom, a sense that originates in the ego's awareness of its mastery over unconscious impulses. The concept of psychic determinism is repugnant to this aspect of the ego, and can command only intellectual acceptance. As a consequence of normal differential ego function, therefore, one has a feeling of freedom of the will, but the ego simultaneously has a (nonfeeling) intellectual conviction that psychic determinism is a fact.