The Seven Passions of the Heart and the Seven fires of spirit: How Love as Passion damages the Spirit by separating the Yuan Qi into yin qi and yang qi

when you build up qi - then with the eyes open - the qi goes out of the eyes - the yin qi of the liver goes out of the eyes via the heart with the eyes open. This causes the heart to then have passion.

What's the connection of the heart to the lungs?

  Quote

When the heart is in excess it will over-act upon the lungs...

At this stage, when the foundation has been laid with all 
centres (and channels) cleared and no obstructions remain¬ 
ing, if the practiser is not strongly 

supported by a dogged 
determination, gives rise to passion 

when seeing beautiful 
forms, and lets spirit chase after sense

 data, once he slips, all 
previous progress will be fruitless. 

It is like upsetting the 
contents of a basket by turning it upside down.

So the yin shen going out of the eyes is the "hun soul" but the po soul of the lungs "grabs onto" the hun soul - if your eyes then obsess over what the heart sees. Just study "evil fire" of the heart - in the book Taoist Yoga: alchemy and immortality.
https://archive.org/stream/TaoistYogaAlchemyAndImmortalityLuKuanYCharlesLuk/Taoist Yoga Alchemy and Immortality Lu K’uan Yü (Charles Luk)_djvu.txt

Quote When the eyes twinkle and the heart vibrates in sympathy, this is the ‘chief fire’ (chun huo), also called the heart’s fire. It is evil fire aroused by thoughts and should be avoided by the practiser. When the eyes see the opposite sex thereby giving rise to (evil) thoughts, the heart moves in sympathy and arouses the genital organ, if the practiser then tries to gather the alchemical agent, the impure generative fluid will produce an illusory agent. This illusory agent is likened to a football which, being kicked continuously, will lose air and shrink. Likewise as thoughts increase the evil fire which becomes more intense, the genital organ will be aroused more frequently. If you wrongly think that the alchemical agent is being produced and strive to gather it, your efforts will be sterile, and you will only harm yourself. Your body seems to be strong (so long as this evil fire lasts) but your health suffers from the consequences and will really decline. Frequent arousal of sexual desire is likened to putting straw on the head while going to extinguish a big fire; you will only injure your body, and will not only fail to achieve immortality but will also run the risk of shortening your life. Therefore, you should avoid gathering the alchemical agent when your heart’s fire is aroused by evil thoughts. and there is more:   There are also meditators who (inadvertently) arouse the evil fire in the liver and kidneys which blurs their vision, and causes them to see double, their eyes to become astigmatic, the pupils to enlarge and the white to redden. and

  Quote

If the practiser wants to avoid stirring this evil fire which can drain away the ‘precious thing’ at night, he should know that the trouble is caused by unwholesome food and intoxicating drink, by perverse thoughts and desires, by hot baths which scatter the heat of the elixir and by (uncontrolled) fire that scorches the body. This has many causes but mainly results from not taking precautions against the misuse of fire during the training. The practiser may also feel hot in the heart which causes him to be parched with thirst and to eat and drink too much. If he fails to overcome this fire his ‘most precious thing’ will drain away at night.

and

  Quote

he should make pointed concentration to take hold of the black object firmly, breathe in fresh air to drive it into the lower tan t’ien (under the navel) and breathe out slowly to expel the inner evil fire which will then vanish; he will then feel truly at ease. There is no fixed number of inhalations to drive the dark object into the lower abdomen and of exhalations to expel the malefic fire, but they should be continued until the evil fire is completely extinguished.

and

  Quote

the drain of positive vitality caused by the failure to stop fire in order to gather the macro- cosmic alchemical agent, but in your case your genital organ is aroused and shaken by the evil fire (of passion) due to lack of vitality and the weakness of the alchemical agent; if you do not gather more vitality and block the discharge channel for the generative fluid you cannot prevent the positive principle draining away.’

and

  Quote

The outer agent which you have gathered is an illusory false one created by wrong thoughts; hence the nocturnal emission. This illusory agent is the generative fluid which contains the evil fire that develops when it is aroused by the vital force. The genital organ swells and quivers when the generative and vital forces vibrate causing this evil fire to scorch the testicles and so dilate the generative duct to drain the positive principle away. You have wrongly used this generative fluid which cannot be transmuted into immortal seed when it contains the evil fire (of passion) and cannot be employed to produce the macrocosmic agent;

and

  Quote

Heart’s fire is the fire of passion excited by evil thoughts which arouse sexual desire; this is ‘chief fire’ (chun huo) or evil fire which should be avoided.

and :

  Quote

True nature is prenatal vitality [yuan qi] in its cell (ch’i pao) on the top of the medulla oblongata [the pineal gland third eye]. If vitality is allowed to pass through the back of the head and down to the base of the spine to drain away through the anus and genital organ, its exhaustion will cause death. This exhaustion of vitality is in no way related to the breath that comes in and out through the nostrils and mouth. In nocturnal emissions the generative fluid carries with it (some) vitality which thus leaves its vibrating cell in the centre of the brain [pineal gland] to pass into the spine and then reach its base to drain away. It is this vitality which animates spermatozoa which, in its absence, become lifeless and non-reproductive. This cell is linked with the brain above it, the base of the spine below and the whole nervous system in the body and is the source of the vital energy of life. When the heart is stirred by sexual desires, it is impossible to draw back this vital force which will drain down in the marrow of the spine to leave the body; it will then be impossible to cultivate (eternal) life. That which so drains off is prenatal vitality and although sexual intercourse has not actually occurred, it nevertheless runs away by the genital gate.

and

  Quote

For the death of the earthly heart exposes the moonlight of (essential) nature which is always screened by the dust of passions so long as the mortal mind is allowed to exist. ...

In your meditation when you achieve utter still¬ 
ness the inner mechanism suddenly dilates and quivers in 
the absence of evil thoughts that stir  

the passionate heart. 
This is caused by the vibration of vitality in the lower tan 
t’ien centre (under the navel) in spite of the absence of 
thoughts. If the practiser does not recognise this vibrating 
vitality he will achieve nothing.

 and

The genital organ is also aroused and stands erect in the 
absence of sexual desire; this is due to the postnatal genera¬ 
tive force vibrating in the body (to seek an outlet) and also 
to the inadequate circulation of fire during your meditation 
which fails to reach and check the penis. 

 and

Most practisers fail in their training because they do not know how 
to control this fire which intensifies the very passions which they intend 
to cut off. Hence many religious men break the rules of pure living and 
commit immoral acts which can be easily avoided by the ordinary man. 

 and

the heart is the house of fire. When the heart is 
stirred the penis stands erect in spite of the 

absence of 
thoughts. This is real fire in its house, which 

arouses the 
genital organ, and although thoughts are absent, 

this fire 
is not the genuine one which vibrates at the living hour 
of tsu (between 11 p.m. and 1 a.m.) when the penis erects. 13 
If you gather the alchemical agent at this unsuitable mo¬ 
ment it is too young because vitality is not full and can 
scatter easily; hence the agent should not be gathered for 
it is not the proper time to do so.

 and

If he has 
previously given rise to perverse thoughts while gathering 
the generative force, to sexual desires when seeing attractive 
women or to disturbance at licentious talk, the arousal of 
the genital organ indicates that he will lose the ‘precious 
thing’ at night even in the absence of thoughts during his 
sleep. It will be a matter for regret if he does not practise 
the method dealt with here to stop nocturnal emission. 

and

As to the erection of the penis in the absence of (perverse) 
thoughts, this is due to the manifestation of the positive 
principle at the living hour of tsu (i i p.m.-i a.m.) when you 
should take advantage of it to practise the two phases (of 


ascent and descent in the microcosmic orbit) in order to 
gather the alchemical agent (as explained earlier). 

Therefore, you should not confound the dilation and 
vibration of the genital root with the erection of the penis 
for they have nothing in common. 

 and

If spirit wavers causing nocturnal emission 
of the ‘most precious thing’ the absence of this light con¬ 
firms the loss of real positive generative force.

and

The practiser now should guard 
against the arousal of intellect which will prevent vitality 
from developing and spirit from continuing; he should never 
break the prohibition against both (utter) neglect and (un¬ 
due) attention. If stirring thoughts cause the spiritual 
body to vanish, this is due to neglect; and if the heart does 
not wander outside and never strays from the spiritual 
body, this is due to absence of neglect. If he is unduly 
specific and obstinate thereby hindering the process of 
alchemy this is because of excessive attention; but if he 
refrains from interfering with what is happening quietly, 
this is freedom from undue attention. Neglect leads to 
dullness and confusion and excessive attention to the dissi¬ 
pation (of spirit and vitality); these are grave mistakes which 
all practisers should avoid. 

 and :

Seven passions that damage vitality, The: Intense delight  

that harms 
the heart; intense anger the liver; grief the lungs; fear the 
gall bladder; love spirit; hate the disposition; and intense 
desire the stomach.

 and

Therefore, alchemy consists first in controlling the heart 
(the seat of fire) so that it cannot be stirred by the seven 
emotions (pleasure, anger, sorrow, joy, love, hate and 
desire)

 and

The above seven kinds of fire: freezing, driving and 
lowering the fire, shifting fire, calming fire, fire in its own 
house and the heart’s fire, come from spirit and can trans¬ 
mute the generative force into vitality. This spirit’s fire 
derives from the spiritual power in the eyes, and if supported 
by postnatal breathing through the nostrils, can sublimate 
the generative force and sustain the inner vital breath.

 and

The technique of lifting fire should on no account be 
used frequently for to do so causes dizziness and injures 
vitality. Each turn of the eyes causes vitality in the cavity 
of life to soar up, spreading to the mouth, eyes, ears and 
nostrils which are the seven openings by which vitality 
scatters away. Of the seven, the heavenly pool 

cavity 
(t’ien ch’ih) above the mouth is the opening by 

which the 
greatest quantity of vitality drains away. This 

is why the 
loss of vitality due to excessive speaking and 

singing is 
comparatively greater than in other activities.

and

The generative force is neither matter nor form; when 
it remains in the body, it is vitality and when it is discharged, 
it is the generative fluid. It is impaired within by the seven 
passions (i.e. joy [heart], anger [liver], grief [lung], fear [kidney], love [hun spirit],  

hate [po spirit] and desire [stomach]) 
that affect the heart

 and

Seven kinds of fire, derived from spirit, to transform the generative 
force into vitality