Mind, Character and Personality, Volume 2 - Ellen G. White

Electrical Force of Brain Resists Disease.—
The minds of thinking men labor too hard. They
frequently use their mental powers prodigally,
while there is another class whose highest aim in
life is physical labor. The latter class do not
exercise the mind. Their muscles are exercised
while their brains are robbed of intellectual
strength, just as the minds of thinking men are
worked while their bodies are robbed of strength
and vigor by their neglect to exercise the
muscles....
Their influence for good is small in comparison
to what it might be if they would use their brains as
well as their muscles. This class fall more readily if
attacked by disease; the system is vitalized by the
electrical force of the brain to resist disease.—
Testimonies for the Church 3:157 (1872).
Discontented Repinings Bring Sickness.—
That which brings sickness of body and mind to
nearly all is dissatisfied feelings and discontented
repinings. They have not God, they have not the
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