The word is derived from Latin serpens, a crawling animal or snake. Snakes have been associated with some of the oldest rituals known to humankind and represent dual expression of good and evil.
It has been always related to sex, power, love and wisdom. Sometimes depicted as a winged snake or as a dragon or as a flying crocodile (Amaru Tupac for the Incas), but always a reptile with plumes. It is a real mix between the lower level of a person and the most amazing grace of the divinity.
On one hand it is the reptile which crawls on the soil, the inferior nature of humanity: Desires, revenge, passion, violence, etc. On the other had there is the plumed serpent (Quetzalcoatl, Kukulcan, the Pharaoh, the Chinese Dragon, the Kundalini, etc.) which is the superior nature of every human being: Control, forgiveness, love, tolerance, etc.
Fertility and Rebirth
In religion, mythology, and literature, serpents and snakes represent fertility or a creative life force. As snakes shed their skin through moulting, they are symbols of rebirth, transformation, immortality, and healing. The ouroboros is a symbol of eternity and continual renewal of life.
In the Abrahamic religions, the serpent represents sexual desire. According to the Rabbinical tradition, in the Garden of Eden, the serpent represents sexual passion. In Hinduism, Kundalini is a coiled serpent, the residual power of pure desire.
Serpent eating it's tail
The Ouroboros or Uroborusis an ancient symbol depicting a serpent or dragon eating its own tail.
The Ouroboros often represents self-reflexivity or cyclicality, especially in the sense of something constantly re-creating itself, the eternal return, and other things perceived as cycles that begin anew as soon as they end (compare with phoenix). It can also represent the idea of primordial unity related to something existing in or persisting from the beginning with such force or qualities it cannot be extinguished. The Ouroboros has been important in religious and mythological symbolism, but has also been frequently used in alchemical illustrations, where it symbolizes the circular nature of the alchemist's opus. It is also often associated with Gnosticism, and Hermeticism.
The staff of Moses
transformed into a snake and then back into a staff (Exodus 4:2–4). The Book of Numbers 21:6–9 provides an origin for an archaic copper serpent, Nehushtan by associating it with Moses. This copper snake according to the Biblical text is wrapped around a pole and used for healing. Book of Numbers 21:9 "And Moses made a snake of copper, and put it upon a pole, and it came to pass, that if a snake had bitten any man, when he beheld the snake of brass, he lived."
When the reformer King Hezekiah
came to the throne of Judah in the late 8th century BCE, "He removed the high places, broke the sacred pillars, smashed the idols, and broke into pieces the copper snake that Moses had made: for unto those days the children of Israel did burn incense to it: and he called it Nehushtan."
2 Kings 18:4.
In the Gospel of John 3:14–15
Jesus makes direct comparison between the raising up of the Son of Man and the act of Moses in raising up the serpent as a sign, using it as a symbol associated with salvation: "As Moses lifted up the serpent in the wilderness, even so must the Son of Man be lifted up, that whoever believes in Him should not perish but have eternal life".
ETERNITY IS MADE OF COUNTLESS CYCLES.
THE SERPENT EATS ITS TALE, BUT IT NEVER DIES!
Birth and death are the same, just in a different form. A person dies, but its energy (what the person really is), cannot die; therefore death is a new beginning in another part of the universe or in another region of it!