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According to Hindu tantrism, the entire universe is considered to be the divine stage where Shiva and Shakti carry on the drama of life. Tantra deals with ritual and spiritual practices to attain the grace of that Shakti, with the aim at achieving liberation from darkness of ignorance, thus also attaining immortality.
The Vigyan Bhairav Tantra is 5000 year old ancient Indian text on meditation. The book is in the form of a dialogue between lord Shiva and his wife Parvati (or Devi), about Universe, about fundamental nature of this world, how to go beyond space and time to realize ultimate truth. They discuss meditation techniques useful for realizing our true self.