Never complain and never explain.
You never know what motivates you.
To be a good loser is to learn how to win.
What you do today can improve all your tomorrows.
The dog that trots about finds a bone.
Only the educated are free.
It's always too early to quit.
To know oneself, one should assert oneself.
The most effective way to do it, is to do it.
Be kind whenever possible. It is always possible.
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.