Swami Swatmarama, Hatha Yoga Pradipika
“ These Mahāsiddhas (great masters) , breaking the sceptre of death, are roaming in the universe. Like a house protecting one from the heat of the sun, Hatha Yoga protects its practisers from the burning heat of the three Tāpas; and, similarly, it is the supporting tortoise, as it were, for those who are constantly devoted to the practice of Yoga. A yogi or yogini desirous of success should keep the knowledge of Hatha Yoga secret; for it becomes potent by concealing, and impotent by exposing. ”
