You never know what motivates you.
The most effective way to do it, is to do it.
It's always too early to quit.
Either you run the day or the day runs you.
Begin to be now what you will be hereafter.
If you can dream it, you can do it.
Always desire to learn something useful.
The wise does at once what the fool does at last.
I can, therefore I am.
After a storm comes a calm.
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.