This essay compares the symptoms of psychosis with hallucinatory experiences associated with religious practice. Based on the author’s experience, I make this comparison from a subjective standpoint. The hallucinatory experiences that accompany religious practice are called “Makyo.” The phenomenon arises at a certain stage of religious practice, and it is not a destination, but a pass. The symptoms of mental illness can also be regarded as being fixed in a “Makyo.” Mental illness cannot be regarded as a religious practice, but it is meaningful to understand that it has a common trait. In the case of religious practice, methods are prepared to go beyond the “Makyo”. Understanding how to do this may be helpful when considering the treatment of mental illness.