essence
the intrinsic nature or indispensable quality of something;
an extract or concentrate obtained from a plant or other matter

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essential

essence
the cream
quintessence
refined essence

essence
finest part
quintessence
the cream of
refined essence

Essence, Energy, Spirit
精: essence of life,
氣: energy of qi (chi),
神: spirit and mental strength

primordial spirit
(Taoist doctrine)
fundamental essence of life

soul
essence of something

true meaning
real essence

marrow
pith, essence

key element
essential factor
fundamental element