It is hard to convince a high-school student that he will encounter a lot of problems more difficult than those of algebra and geometry.
Don't be crazy to do a lot of things you can't do.
To be an ideal guest, stay at home.
No man's credit is ever as good as his money.
The way out of trouble is never as simple as the way in
A boy doesn't have to go to war to be a hero; he can say he doesn't like pie when he sees there isn't enough to go around.