namely : that the tranquil, calm, poised, peaceful
(what we may call the natural) states of
mind always tend to health — are healthful ;
and, oppositely, that the disturbed, disquieted,
distressed states of mind ever tend to disorder
the body — are diseaseful.
And all this is by a natural law which is of
transcendent scope and which has far-reaching
consequences. Knowledge of it and conformity
to it promise to be of immense
practical value to mankind.

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