What you do today can improve all your tomorrows.
Quality is not an act, it is a habit.
By failing to prepare, you are preparing to fail.
Always desire to learn something useful.
Know or listen to those who know.
Begin to be now what you will be hereafter.
The most effective way to do it, is to do it.
Be gentle to all and stern with yourself.
Without hard work, nothing grows but weeds.
If you've got a talent, protect it.
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.