Zeng says Falun Gong has spread so quickly simply "because it is so good"; the positive effects on followers' physical and mental health are "so obvious". She says she wrote her book to "expose the evil" of China's labour camps and to highlight the plight of other Falun Gong inmates: "What we ask is for an end to the persecution and for the freedom to practise our own beliefs. I regard that as basic human rights -- it's not political at all."