Voici un texte (en anglais, faute de pouvoir le traduire assez bien, mais s'il y a des volontaires n'hésitez pas) sur le tantrisme. Il est cité à partir du cite qui relate les activités caritatives et les enseignements spirituels transmis par Mata Amritanandamyi Devi. Ce sont des questions/réponses qui débutent avec une échange sur le Linga (représentation du Divin ou de Shiva).
Je vous invite à le lire plusieurs fois à différents moments pour bien en comprendre tous les enseignements.
LE TANTRISME
Why the Shiva linga ?

We can not understand why some people ridicule and insult the divine symbols and images in Hindu faith. The Shiva linga is not a symbol of one particular religion; it actually stands for a scientific principle.
Today scientists say that the universe is egg-shaped. In India, for thousands of years, the universe was referred to as Brahmandam, meaning the ‘great egg.’ Brahman means the absolute greatest. The Shiva linga is a microcosm of that vast cosmic egg. When we worship the Shiva linga, we are, in fact, worshipping the entire universe as the Auspicious Form and as the Divine Consciousness, This is not the worship of a God who sits somewhere beyond the sky. This teaches us that any selfless service rendered to the universe, including to all living beings, is worship of Shiva.
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Absolute Reality, is the Source and Support of everything. It is devoid of attributes, qualities, and form. How can the attributeless be described? In this difficult context, the sages found a symbol to represent that initial stage between Brahman and creation: the Shiva linga. It signifies the creation of the universe out of Brahman. The Shiva linga is the symbol the Rishis used to reveal the truth they experienced in a way ordinary people could understand.
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The word Shiva means “auspicious”. Auspiciousness doesn’t have a form. By worshipping the Shiva linga, which is a symbol of auspiciousness, the worshipper receives that which is auspiciousness.
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The meaning of linga is not phallus; for not even fools would pray to a male’s sexual organs for protection!
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Q: Some people describe the Shiva linga as obscene. Is there any basis for this?
Amma: My children, people talk that way only because they do not understand the principle behind the Shiva linga. Each individual sees either good or bad in everything depending on that person’s inner tendencies.
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Shiva burnt Kama ( lust and desires) with his third eye. In that state of Supreme Bliss, there is no female and male, mine and yours. Shiva linga helps us grasp this principle and frees us from lust. That is why the Shiva linga is worshipped by both men and women, the old and the young, the Brahman and the outcaste.
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Q: It is said that Shiva dwells in funeral grounds. What is the meaning of this?
Amma: Desire is the cause of suffering. At the cremation grounds, the body with all its material desires are reduced to ashes. And there, where desires are absent and there is no body consciousness, Lord Shiva dances in bliss. That is why he is called the resident of the cremation grounds. The meaning of this is not that bliss comes to us only after death. Everything is within us. We and the universe are one. We are automatically filled with bliss, when in the fire of Self-awareness the attachment to the body dies.
Shiva’s body is decorated with ashes from the funeral pyres. This is the symbol of having conquered all desires.
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Tantric Sadhana (sadhana = ascèse/engagement/pratique spirituelle)
Tantric sadhana is one of the most misunderstood and misinterpreted paths. In the name of tantric sadhana people start drinking, engaging in sex and other licentious and irresponsible behavior. They say that they are offering it to the Divine Mother, but ultimately such people get totally carried away by such indulgence. Their ignorance about real sadhana becomes denser and denser, and so they argue that whatever they do is correct.
What is involved in tantric worship is an offering. The fact is, the principle behind the worship is what is to be offered. This offering is not external; it is internal. You offer your individuality, or your ego, to the Divine. Furthermore, the references to sexual union in the worship are not to be taken as something to be done by a male person and a female person. It is the final union, the union of the jivatman (individual self) and the Paramatman (the Supreme Self). It is symbolic. It symbolizes the union or the integration of the feminine and masculine qualities – the union of Purusha and Prakriti, the merging of the mind into the Supreme Reality. It is the attainment of a perfect balance between the inner and outer natures of the sadhak. It is the experiencing of and becoming established in All-Pervasiveness, which ensues from the union of Shiva and Shakti.
In that state the sadhak transcends everything and merges with the Supreme Principle. That Supreme Oneness is the meaning of sexual union in tantric puja.
This union of Shiva (Supreme Consciousness) and Shakti (Primordial Energy) happens when the sadhak’s purified semen, which has transformed into ojas (pure vital energy) reaches the top of the head where the thousand petalled lotus is located. The use of sexual imagery as symbolic imagery in tantric sadhana is an external, figurative depiction of this inner transformation. Sexual union is the closest symbol that can give the idea about this eternal union of Shiva and Shakti. Both aspects, Supreme Consciousness and Primordial Energy are within us.
All human beings are sexual, and therefore, all are familiar with the experience of sexual desire, the longing for union with the opposite sex. Thus by employing something that everybody can understand, that is, the terms and symbols of sexual union, to express the essential quality and process of eternal union, the sages have tried to give us an idea of the process of inner union. But human minds are so crude and lowly that they misinterpret the whole thing and bring it all down to a vulgar level, misusing it or using it as an excuse for licentious behavior and illicit actions that can cause harm to others as well as themselves. Tantric sadhana must not be practiced without the guidance of a Perfect Master.
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When a man and a woman move forward together with love, mutual understanding, and a willingness to be flexible to the other’s needs, what develops is not equality between them, but union—the union of Shiva and Shakti. That is the world of joy. The man and the woman become one, forgetting all differences.
Source : https://www.amritapuri.org/8223/lord-shiva.aum