I can, therefore I am.
Problems are not stop signs, they are guidelines.
If you've got a talent, protect it.
To know oneself, one should assert oneself.
Know or listen to those who know.
If you're going through hell, keep going.
Things do not happen. Things are made to happen.
Begin to be now what you will be hereafter.
Never complain and never explain.
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.