Projection, Perls explains that parents, in his system of understanding, often reappear as a patients' conscience. His first book, Ego, Hunger, and Aggression, explains more of his idea of guilt as projected resentment. Whenever you feel guilty, find out what you resent and the guilt will vanish and you will try to make the other person feel guilty.' The key to resolving resentment, according to Perls, was expressing one's anger. In Gestalt Therapy Verbatim - a book of collected transcripts- Perls says, 'We see guilt as projected resentment. Fritz Perls and Gestalt Therapy both offer great insight into guilt.