By pursuing one line of thought exclusively, the mind often becomes unbalanced. But every faculty may be safely exercised if the mental and physical powers are equally taxed and the subjects of thought are varied. (Ed 209.1) MC VC

Physical inaction lessens not only mental but moral power. The brain nerves that connect with the whole system are the medium through which heaven communicates with man and affects the inmost life. Whatever hinders the circulation of the electric current in the nervous system, thus weakening the vital powers and lessening mental susceptibility, makes it more difficult to arouse the moral nature. (Ed 209.2) MC VC

Again, excessive study, by increasing the flow of blood to the brain, creates morbid excitability that tends to lessen the power of self-control, and too often gives sway to impulse or caprice. Thus the door is opened to impurity. The misuse or nonuse of the physical powers is largely responsible for the tide of corruption that is overspreading the world. “Pride, fullness of bread, and abundance of idleness,” Ezekiel 16:49. are as deadly foes to human progress in this generation as when they led to the destruction of Sodom. (Ed 209.3) MC VC

Teachers should understand these things, and should instruct their pupils in these lines. Teach the students that right living depends on right thinking, and that physical activity is essential to purity of thought. (Ed 209.4) MC VC