What are some books about nonlinear subjects?

He married Margaret Hawkins, with whom he has one daughter named Sarah. Due to his spiritual conversion in January 1965 and the course of subsequent life changes he divorced her. In 1979 Hawkins gave up his large practice for a seven-year-period of a frugal life in Arizona as a hermit. After 12 years of spiritual study and meditation, partially earning his living as a truck driving “dung baron“, he relearned worldly manners again to become an “ordinary man“. Susan Humphrey, later his second wife, entered his life in 1991, being the one, who strongly insisted that he would publish his findings. Until 1995 he had remained publically silent about his claimed extraordinary spiritual states such as his first memory, a sudden awareness of existence, at the age of 3, his NDE as a youngster, sensing the “excruciating immensity of the suffering of mankind“ at 16, and his claimed enlightenment at 38 years, which he believes terminated his personhood, followed by his unity experience in 1977 in Rothman's Restaurant in Long Island..