Mental exercise

Definition and stakes

Arnold James Cooley,  Cooley's Cyclopædia of Practical Receipts and Collateral Information in the Arts…

“ By exercise the mind too is excited to healthy action, its gloomy reveries are dispelled, and the fair face of creation is presented to the mind’s eye in its proper hues. It robs undue mental exertion of half its injurious effects upon the body, whilst it stimulates and directs it in its proper course. It improves the temper, and humanises the character. The disposition is refined, the passions restrained, violent emotions checked, the habits improved, and the personal charms promoted under the stimulus of judicious exercise. ”
Source: Gutenberg

Ira Mayhew,  Popular Education

“ I shall conclude this chapter with a few rules relating to mental exercise, and the development and culture of the mind and brain. It is a law of the animal economy that two classes of functions can not be called into vigorous action at the same time without one or the other, or both, sooner or later sustaining injury. Hence the important rule never to enter upon continued mental exertion or to rouse deep feeling immediately after a full meal, otherwise the activity of the brain is sure to interfere with that of the stomach, and disorder its functions. ”
Source: Gutenberg

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