"The Mula Bandha Mudra is the best Mudra to control the Apana and Prana, and is the key to everlasting youth. Mixing the Prana and Apana causes heat in the body; that heat causes the Kundalini to awaken--then she goes upward thru the Sushumna. In that Sushumna all wisdom and powers are.
"Jalandhara Mudra is the well tried Mudra for keeping old age, decay and death away. It saves the nectar and keeps the vital force moving in the right Nadi. Who practices this Mudra daily, becomes an adept. Yogi should practice Maha Bandha, Udiyana and Jalandhara all at once.
"Khechari Mudra is the King of all the 'Mudras. It is hard to attain. The Yogi who masters it even for half an hour, will overcome hunger, thirst, decay and death--his body becomes divine. The earth, water, fire, air and ether can not harm that body. Yoni Mudra, Viparitakaran Mudra, Vajroni Mudra, Sakti Mudra, Manduki Mudra and Sambhavi Mudra are well tried, and will awaken the Kundalini.
"The five Dharanas should be learned from a Master. With these Dharanas a Yogi goes wherever he wants to with his physical body; he may go to Heaven, walk on water, air and fire. and is Master of All. Except for the practice of Kundalini, what other means ate there to purify the Nadis? Once setting this power moving, Yogi should practice constantly. Who can practice a yama, need have no fear of death. Hatha Yoga and Raja Yoga should be practiced together, as Hatha Yoga is dependent upon Raja Yoga and Raja Yoga is dependent upon Hatha Yoga. These Mudras should not be taught to the wicked and faithless, but they should be taught to calm, peaceful and faithful students. And he who teaches the secret of the Mudras is the real Guru. He can be called Ishwar (God), in human form.
"What more shall tell, O Devi? There is nothing in this world like the Mudras to attain the human goal quickly and successfully."