The Trigrams:
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These four (hexagrams #1, #2, #29, #30) in indistinction,
are right with empty non-being.
Sixty hexagrams revolve around them,
outspread like a chariot.
Harnessing a dragon and a mare,
The enlightened ruler holds the reins of time.
-- Wei Boyang (Cantong Qi, Triplex unity, 2nd c. Taoist text)
The thirty spokes unite in the one nave;
but it is the empty space for the axle, that makes the wheel useful.
-- Dao De Jing #11
#1 Qian (Heaven) and #2 Kun (Earth) form the crucible and furnace within;
#29 Kan (Water) and #30 Li (Fire) are the medicinal substances
from which the Elixir is made.
The rest of the sixty hexagrams consequently make up the firing times
– through which the Elixir is taken.
-- Master Shangyang (Commentary on Cantong Qi)
Qian is represented in the heavens above, and Kun in the earth beneath.
They form the image of the axle and are the body of change.
Kan and Li rising and falling between them represent the hub
that turns upon the axle and make up the function of change.
Within a human, Qian and Kun are the cauldron and the furnace
while Kan and Li make up the ingredients of the Elixir.
Of the sixty-four hexagrams of the I Ching,
the reason Heaven ☰ and Earth ☷ are the gate and door
is to show people the path of firmness and flexibility, simplicity and readiness.
The other sixty-two hexagrams show people the path of modification
of simplicity and readiness.
The three hundred eighty-four lines of the sixty-four hexagrams all teach people
how to know when they are not simple and ready,
and to modify this so that they may eventually become simple and ready.
Modification to simplicity and readiness means that awareness
and capability (to have self-awareness) are in their innate condition of innocence,
and one is a superior person.
If one does not change to simplicity and readiness, then awareness and capacity are faulty,
and one is an inferior person.
The difference between superior people and inferior people is simply a matter of whether
or not they know how to make this change.
-- Liu Yiming (Taoist I Ching, The path of superior people is eternal, the path of inferior people is miserable.)
The Taiji and the Twelve Sovereign hexagrams.