Always desire to learn something useful.
What you do today can improve all your tomorrows.
To be a good loser is to learn how to win.
It's always too early to quit.
The most effective way to do it, is to do it.
Problems are not stop signs, they are guidelines.
Never complain and never explain.
Only the educated are free.
Without hard work, nothing grows but weeds.
Be thine own palace, or the world's thy jail.
I wrote somewhere during the Cold War that I sometimes wish the Iron Curtain were much taller than it is, so that you could see whether the development of science with no communication was parallel on the two sides. In this case it certainly wasn't.