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:|
does not bring tears into the eyes. Nor does the voluntary and
prolonged contraction of the several surrounding muscles suffice.
As the lacrymal glands of children are easily excited, I persuaded
my own and several other children of different ages to contract
these muscles repeatedly with their utmost force, and to continue
doing so as long as they possibly could; but this produced hardly
any effect. There was sometimes a little moisture in the eyes,
but not more than apparently could be accounted for by the squeezing
out of the already secreted tears within the glands.
The nature of the relation between the involuntary and energetic
contraction of the muscles round the eyes, and the secretion of tears,
Expression of Emotion in Man and Animals