“There are two different energies which are in conflict – Ha and Ṭha.
Because of these two energies we are not in our natural state.
Why do they never meet?
Because there is a big obstacle in the form of a coiled serpent.
Further we add to the obstacle rather than reduce it.
Through practices we can use the fire that is in our system to slowly reduce the obstacle.
When this happens the two have the possibility of entering Suṣumnā and become one.
When this happens there is the union of Ha and Ṭha.”
– TKV Desikacha