Now, as in the days of Israel, every youth should be instructed in the duties of practical life. Each should acquire a knowledge of some branch of manual labor by which, if need be, he may obtain a livelihood. This is essential, not only as a safeguard against the vicissitudes of life, but from its bearing upon physical, mental, and moral development. Even if it were certain that one would never need to resort to manual labor for his support, still he should be taught to work. Without physical exercise, no one can have a sound constitution and vigorous health; and the discipline of well-regulated labor is no less essential to the securing of a strong and active mind and a noble character....