Now, with this explanation, the posture. Trying to control the mind, a certain posture is necessary. Any posture in which the person can sit easily — that is the posture for that person. As a rule, you will find that the spinal column must be left free. It is not intended to bear the weight of the body. ... The only thing to remember in the sitting posture: [use] any posture in which the spine is perfectly free of the weight of the body.
- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 4/Lectures and Discourses/Concentration
(Delivered at the Washington Hall, San Francisco, on March 16, 1900)