Swami Vivekananda wrote a book called Raja Yoga about how he rewrote Patanjali's Yoga Sutras for a Western audience. The book is called Raja Yoga. Raja Yoga was an instant hit and had a big impact on how people in the West thought about yoga. De Michelis says that Raja Yoga is the beginning of modern yoga, even though yoga has changed a lot since then. Raja Yoga has transcripts of Vivekananda's talks on "Raja Yoga" and his interpretation of Patanjali's Yoga Sutras. It also has a "rather free translation" of Patanjali's Yoga Sutras with Vivekananda's commentaries, which was also a set of talks. It gives strange teachings to a group of cultists who were looking for "ideologically familiar forms of practical spirituality."