Traditional Tantric Texts
Tantra has its roots in an oral tradition, which existed for thousands of years before any written documents were produced. A complex interaction of cultural influences over many millennia has resulted in a vast array of Tantric texts, many of which directly contradict others. Aspects of Tantric philosophy and practice have been adopted into mainstream Hinduism, though modern-day Hindus would deny any association with Tantra. Political and economic pressures have shaped the writing of some more recent Tantric texts. Misunderstandings at each point of translation have multiplied over the years. Many traditional texts were written in obscure language, to ensure that non-initiates would be unable to decipher their secrets. Discovering the true core of Tantra requires dedication, and the guidance of an experienced teacher.
"Hatha Yoga Pradipika" written by Swami Svatmarama somewhere between the twelfth and fifteenth centuries (English translation, 1992)