But when the six emotions are stagnant,
the will travels but the spirit stays put,
a petrified and withered tree,
hollow and dry as a dead river.
Then you must excavate your own soul,
search yourself till your spirit is refreshed.
But the mind gets darker and darker
and you must pull ideas like silk from their cocoon.
Sometimes you labor hard and build regrets
then dash off a flawless gem.
Though this thing comes out of me,
I can't master it with strength.
I often stroke my empty chest and sigh:
what blocks and what opens this road?
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by Lu Ji
from The Art of Writing, 300AD