Leap, and the net will appear.
If you think you can do it, you can.
Well done is better than well said.
Be thine own palace, or the world's thy jail.
If you're going through hell, keep going.
Things do not happen. Things are made to happen.
Only the educated are free.
I can, therefore I am.
If you've got a talent, protect it.
Begin to be now what you will be hereafter.
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.