Muscles are in a most ...

Muscles are in a most intimate and peculiar sense the organs of the will. They have built all the roads, cities and machines in the world, written all the books, spoken all the words, and, in fact done everything that man has accomplished with matter. Character might be a sense defined as a plexus of motor habits.
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 G. Stanley Hall

Quotes from the same author

Abundance and vigor of automatic movements are desirable, and even a considerable degree of restlessness is a good sign in young children.
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 G. Stanley Hall
Of all work-schools, a good farm is probably the best for motor development.
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 G. Stanley Hall
The man of the future may, and even must, do things impossible in the past and acquire new motor variations not given by heredity.
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 G. Stanley Hall
Adolescence as the time when an individual ‘recapitulates’ the savage stage of the race’s past.
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 G. Stanley Hall