"Every young man’s body is worth more to him than any fortune. He can squander it; he can waste it; he can throw it away. How can I burn into your minds and hearts the important duty of conserving this strength unless I make you understand what it costs to raise a boy? The wealth of [America] is not in the ground - it is above the ground. The most important wealth of this country is its manhood and womanhood."
January 1, 1970
https://en.wikiquote.org/wiki/Young_men