To know oneself, one should assert oneself.
Be kind whenever possible. It is always possible.
Who seeks shall find.
If you think you can do it, you can.
Be thine own palace, or the world's thy jail.
Either you run the day or the day runs you.
The wise does at once what the fool does at last.
I can, therefore I am.
If you're going through hell, keep going.
Leap, and the net will appear.
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.