The time spent in physical exercise is not lost. The student who is constantly poring over his books, while he takes but little exercise in the open air, does himself an injury. A proportionate exercise of the various organs and faculties of the body is essential to the best work of each. When the brain is constantly taxed while the other organs are left inactive, there is a loss of physical and mental strength. The physical powers are robbed of their healthy tone, the mind loses its freshness and vigor, and a morbid excitability is the result. {CT 295.2}

Den tid der bruges på fysisk udfoldelse er ikke tabt. Den studerende som hele tiden fordyber sig i sine bøger, medens han kun tager lidt tid til motion i den frie luft, gør sig selv skade. En god blanding af motion af kroppens forskellige organer og evner, er absolut nødvendig for enhvers bedste arbejde. Når hjernen hele tiden belastes, medens andre organer efterlades passive, er der tab af fysisk og mental styrke. De fysiske kræfter berøves deres sunde klang, sindet mister sin friskhed og livskraft, og en sygelig pirrelighed er resultatet.