शुभ धनतेरस

Today is Dhanteras or Dhanvantari Trayodashi, when Dhanvantari , the god of health and Giver of Ayurveda appeared during Sagar Manthan (churning of sea) with the gold pot of Amrit!

What this tale actually means let's see.

Sagar manthan: An allegory

Mandar/Meru parvat used as churning stick : Spinal Cord (Merudand)

Vasuki  ,used a churning rope (same snake from Shiv's neck) : Kundalini

Kshirsagar : sea of energy in mooladhar 

Two forces manipulating Vasuki (Kundalini) to and fro on Mandar ie spine Deva and Danava: Inhale and Exhale of breath 

In Kriya Yoga, sadhna is like Samudra Manthan – churning the ocean of the human consciousness. Mount Mandara (churning rod) is the spine in which Sushumna Nadi is located. 

Devas represent the upward flow of prana which reaches the spiritual planes (inhalation). Vasuki, the serpent, is the energy, prana, kundalini. The Asuras is the descending prana flowing downward to matter. “Upon offering the in-breath to the out-breath, out-breath to the in-breath one performs oblations, and true yajna (fire ceremony)” (Bhagavat Gita). 

This friction is the churning, the Sushumna generating heat, light, coolness, and the internal OMkar sounds.

First the negativities ie the Halahal poison comes up from the churn, the ego, the fears, the complexes, the doubts, the deviations.....when one gets through them sitting like a rock,like Buddha did, then the Riddhi (prosperity) & Siddhis come up, u continue  in ur quest, then finally the amrit ie immortality by Moksha is gained, from the manthan ,ie internal churning.

Buddha suffered the same, that night under the Bodhi tree, when the primal complexes in the human (animal) body first came up to scare and tempt him away, he sat through the torture, rock solid and straight, till he realized himself. 

Summary: By controlled Movement of Kundali energy through Breath control Amrita of Moksha can be attained.