Only the educated are free.
Never complain and never explain.
Well done is better than well said.
The most effective way to do it, is to do it.
It's always too early to quit.
If you can dream it, you can do it.
Do not weep do not wax indignant. Understand.
Know or listen to those who know.
You never know what motivates you.
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.