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This explains the so-called supreme tantric nature of Lord Shiva. He considers his linga as his formless form and his idol as form full form. The linga is a short form of a huge pillar that connects the dark underworlds to the superior cosmic worlds. Brahma and Vishnu could not find its beginning and ending. Similarly, linga also connects Muladhara with Sahasrara. The whole mystery of sexual tantra is hidden in this story of Shiv Purana. If a direct focus is placed on the idol of Shiva or the image of Shiva in the mind, it will not be very effective. But if the image of Shiva on the Vajra is meditated, then it will reach directly into the brain or Sahasrara, and in comparison there it will remain very effective and permanent. The image of Shiva is the symbol of Kundalini here. Anything else like pictures or sensations can be there in the form of Kundalini. By the way, Lord Shiva has asked to worship both his linga and idol together, but has considered linga as the more superior form. From this, it becomes clear that Kundalini can merely develop from various eternal religious traditions, but Tantra has to be supported for its awakening. This is because if the human form and shape of Shiva is not known, then how will one be able to meditate on it over the lingam. The human form of Shiva is known only by its idol. That is why Shivalingam is also placed with idols in most of the temples. Similarly, a real Tantric is not an opponent of Sanatan religious traditions, but a collaborator.
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Demystifying Kundalini 
Of course, Tantra has had parallel life right from the vedic period and i even imagine it may be a bit older if imagine the origin and lifetime of adi yogi going way back. They were called upavedas because of the importance mantras have in it though bindus and pronunciation differs negligible bit in both, and as much yantras being the tools that are the foundation tools for both worlds.
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I agree fully with you friend. Your comment inspired a new thought in my mind. In prehistoric and jungle roaming human being, it was natural for their sexual instinct to roam freely without any hindrance. Their were no proper rules and regulations, keep aside law and order. Therefore, development of rich religious tradition was impossible. Only stair to rise up to salvation was sex. It was only means of entertainment and get extraordinary bliss even greater than today’s civilized world. So it was natural that they new the worldly and spiritual benefits of sex very well including tantric techniques as there were no contraceptives like today. It reinforce your view tantra is older than other religious traditions.
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