"Do not exaggerate the significance of pranayama. The science of breathing practised by true Raja Yogis has little in common with ordinary pranayama! The Hatha Yogis are interested only in the control of the vital breathing of the lungs, whereas the ancient Raja Yogis looked upon pranayama as a mental breathing. Verily, only the mastery of this mental breathing brings the highest clairvoyance, restoring the function of the third eye and leading to the true achievements of Raja Yoga."