Problems are not stop signs, they are guidelines.
Who seeks shall find.
If you can dream it, you can do it.
Quality is not an act, it is a habit.
Do not weep do not wax indignant. Understand.
What you do today can improve all your tomorrows.
Be gentle to all and stern with yourself.
Be kind whenever possible. It is always possible.
Never complain and never explain.
To know oneself, one should assert oneself.
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.