are suffering from heart disease in one form or another, due to the forced physical exertions of the campaigns." Man's faculties and functions are so interrelated that whatever affects one affects all.

Athletes who over-develop the muscular system do so at the expense of the physical, mental, and moral well-being.

It is a law of nature that the overdevelopment of any function or faculty, forcing or straining it, tends not only to ruin it, but also to cause injurious reactions on every other faculty and function.
Vigorous thought must come from a fresh brain.

We cannot expect nerve, snap, robustness and vigor, sprightliness and elasticity, in the speech, in the book, or in the essay, from an exhausted, jaded brain.
The brain is one of the last organs of the body to reach maturity (at about the age of twenty-eight), and should never be overworked, especially in youth.

The whole future of a man is often ruined by over-straining the brain in school.
Brain-workers cannot do good, effective work in one line many hours a day.