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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Expression of Emotion in Man and Animals by Charles Darwin: habitual associations, as it is not under the control of the will.
A man when moderately angry, or even when enraged, may command the movements
of his body, but he cannot prevent his heart from beating rapidly.
His chest will perhaps give a few heaves, and his nostrils just quiver,
for the movements of respiration are only in part voluntary.
In like manner those muscles of the face which are least obedient
to the will, will sometimes alone betray a slight and passing emotion.
The glands again are wholly independent of the will, and a man suffering
from grief may command his features, but cannot always prevent
the tears from coming into his eyes. A hungry man, if tempting food
is placed before him, may not show his hunger by any outward gesture,
 Expression of Emotion in Man and Animals |