Swami Swatmarama, Hatha Yoga Pradipika
“ The Yogi or Yogini, engaged in Samadhi, cannot be killed by any instrument, and is beyond the controlling powers of beings. He or she is beyond the reach of incantations and charms. As long as the Prana does not enter and flow in the middle channel and the vindu does not become firm by the control of the movements of the Prana; as long as the mind does not assume the form of Brahma without any effort in contemplation, so long all the talk of knowledge and wisdom is merely the nonsensical babbling of a mad man or woman. ”
