This potent Qi in your heart/mind :
One moment it arrives, one moment it departs.
It is so tiny there is nothing inside it,
It is so great there is nothing outside it.
The reason that you lose it
Is because impatience causes harm.
When the heart/mind can maintain stillness,
Dao will naturally settle there.
For people who attain Dao :
Regulation supports it and it will not dissipate easily,
So that the center in their breast does not fail them.
When following the Dao of restraining desire,
The ten thousand creatures do not cause harm.[Z]
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A : altho the modern translation of this symbol is "sudden" or "abrupt" (among other things), and is translated different ways by different authors, I have chosen "close" (as in "within reach", "accessible") based on the answers given each time this question is asked
B : using "its" here (rather than "the") is significant, making the difference between referring to the "form of the heart/mind" or referring separately to "the heart/mind" and "the form"
C : this and the next 5 lines could still be talking about the sage, but because it seems to be a different section, it is translated in this fashion
D : Simonis claims that the grammatical sense in which "one" is being used means "one-ing creatures", hence knowing (or seeing, sensing, perceiving, etc.) your oneness with them
E : "spirit-like" is taken to mean that your understanding of Dao has reached the same level as that of the spirits, who are presumably not confused by having senses or a heart/mind (from Simonis)
F : in this and the 5 lines above, it is assumed that it is the creatures and duties that are being transformed and changed, because earlier it is said that the sage takes part in changes but is not himself transformed or changed