Raja Yoga

Rāja Yoga fits in with all other yogas. It fits inquirers of all classes with or without any belief, and it is the real instrument of religious inquiry. As each science has its particular method of investigation, so is Rāja Yoga the method of religion. This science also is variously applied according to various constitutions.

Written during Swamiji's first visit to America, in response to questions put by a Western disciple. Complete Works, 8:154.