It's always too early to quit.
The secret of getting ahead is getting started.
Wherever you are - be all there.
Either you run the day or the day runs you.
Never complain and never explain.
You never know what motivates you.
If you can dream it, you can do it.
I can, therefore I am.
Be thine own palace, or the world's thy jail.
Be gentle to all and stern with yourself.
In those early years in New York when I was a stranger in a big city, it was the companionship and later friendship which I was offered in the Linnean Society that was the most important thing in my life.