Heaven is Yang while Essential Nature is Yin as the Yuan Shen

 Nature-Vitality is yin qi.

Essential Nature is Yin as the Yuan Shen.

Essential Nature only manifests once Life-vitality is RETURNED back to the heart to create Heaven as yang (metal-fire)

So this "vitality" is Nature-Vitality which is the Yang Vitality INHERENT or Hidden in the Jing as "essential" jing or positive jing also positive vitality.

So it has to rejoin the heart to create True Vitality or Spirit-vitality. So that the yang qi or Metal in the Water returns to the Fire of the Heart.

So this is why it's also called (essential) life. Because the yin qi of the heart as Wood is returned to water to create Earth which is Yin but manifests the Yang Shen.

So the Life-vitality of Earth is yin qi but as Yang Qi is returned to it via the third eye purification then the golden light gets stronger.

So "consciousness" in the heart is the Hun Soul as Yin Qi of wood and fire as consciousness.

Only when the Yin Qi is returned to water does Earth manifest as the lower tan t'ien Dragon Cavity. Both wood is dragon - as the Moon of the fire-heart - the yin qi of consciousness - and the lower tan t'ien as Earth is also the Dragon cavity as yin qi.

So then Yang Qi or "positive vitality" is again Nature-Vitality that has been returned from Water back up to the heart (via the cerebrospinal fluid that is swallowed). So once that essential generative force or positive generative force is RETURNED - the hidden Tiger in the water as WHITE TIGER (cerebrospinal fluid) to the heart - then the Yuan Shen manifests.

So with the eyes open then the yin qi goes out of the eyes via the heart. With the eyes closed as in sleep then the yin qi returns back to the liver as the wood qi.

So the wood qi is the Moon as Dragon just as Earth is also the Dragon cavity as Moon. So the Sun is the yang qi as metal just as Heaven is Yang as the Sun fire.

So by rotating the left eye with the right eye and the Sun (left eye) mixes the Fire of the heart with the Yang qi of the metal lower abdomen.  The right eye as Moon mixes the yang qi of sun hidden in the water as metal lung with the yin shen or yuan shen of Heaven - which is the Moon light.

So then the Yuan Qi is created in the brain by this conversion of the yin qi in the blood (wood element left eye) into the yang qi of the cerebrospinal fluid metal lower body).

And so it has to be purified by going down the front channel.

So prenatal generative force is the Yuan Qi created through this purification of the yin qi into yang qi via turning blood into cerebrospinal fluid in the pineal gland.

So we have negative generative force as yin qi and positive generative force and then Essential generative force as essential life and essential nature or Yuan Qi that manifests the Yuan Shen.

But then the accumulation of the Yuan Jing creates the Golden Yang Shen.

So when the eyes are open the heart disconnects from the lower abdomen and so the third eye closes as does the lower tan t'ien elixir field. So the Yang Qi of Essential Nature of Heaven is deconverted back into Yin Qi as the Wood of the Fire as Hun Soul as the Spirit wanders out of the eyes with the eyes open. This causes the metal as yang qi to deconvert back into the water to be lost.

Whereas the purification means the yang qi goes down the front from the yin qi going up via the small universe. So this is why the negative fire goes down the front channel to purify the yin qi into yang qi.

So again the yin qi that used to be the heart has to be returned back to the water by the Fire of the heart being turned around so that the spirit does not go out of the eyes. This creates the Yang Shen or positive spirit of the Earth from the Lower Tan T'ien via the restoration of the Yuan Qi as essential generative force - or Yuan Jing. It's all united as Essential Nature and Essential Life and Essential Force.

So first the Yang Qi of Water as metal is returned to the heart to manifest the Moon Light as the first half of alchemy - the white light is the Negative Light of Essential Nature. It is the Yuan Shen as Yin even though Heaven is Yang.

So life-vitality is yang as the hidden metal in the water while Nature-spirit is Yin as the Yuan Shen.

Amazingly that is the ONLY place in the book that means "nature-spirit."

So the life-vitality or yang qi has the Nature-vitality or Yin qi added to it and the life-vitality is then SWALLOWED after exiting the brain and going down the front channel via the descent of "negative fire" as the Nature-spirit (that cleanses the yin qi).

So even though it is Nature-vitality as yin qi (Green Dragon) it has to be returned back to Earth via the Water that holds the yang qi (as White tiger) as the Nature-Spirit is faced downward to build up into Life-spirit that is golden light as positive from the accumulation of the yin qi from the blood.

OK "life-spirit" is not even found in the book whereas "nature-spirit" is found.

hmmm.

OK so we know that the nature-vitality is negative as yin qi but life vitality as yang qi has to RETURN to nature-vitality in order to manifest Nature-Spirit which is negative.

So therefore the "positive vitality" of (essential) nature is actually the Yang Qi of water or Tiger having been returned to the heart as fire which previously was the yin qi of nature-vitality with the spirit going externally as consciousness that wanders.

So now you have the Tiger Positive Vitality or Life Vitality mixed with Nature-Spirit or negative spirit and you have the Dragon Negative vitality or Nature-vitality mixed with Positive Spirit as golden eternal life.

 

So again the left eye is wood as yin qi or nature-vitality but it is also positive spirit as yang shen.  Why? Because of the Double Reversal of the generative force being returned back down the front.

So the hidden Moon or Dragon of the yin qi mixes with the Dragon Cavity as the Yuan Jing Golden Light of the lower tan t'ien as positive spirit.

so by purifying the yin qi then it converts back into yang qi in the Earth.

So again Nature-Spirit is manifested by Life-vitality going into the heart - from its previous hidden state in the lower abdomen.

Whereas the LIGHT of Life-vitality is from the Yin Qi or negative Nature-vitality being returned back to the water of the lower abdomen to turn it into the Dragon Cavity.