Begin to be now what you will be hereafter.
Be thine own palace, or the world's thy jail.
Only the educated are free.
If you're going through hell, keep going.
Be gentle to all and stern with yourself.
Expect problems and eat them for breakfast.
If you think you can do it, you can.
By failing to prepare, you are preparing to fail.
If you can dream it, you can do it.
It's always too early to quit.
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.