The sure sign of an amateur is he has a million plans and they all start tomorrow.
To feel ambition and to act upon it is to embrace the unique calling of our souls. Not to act upon that ambition is to turn our backs on ourselves and on the reason for our existence.
Turning pro is like kicking a drug habit or stopping drinking. It's a decision, a decision to which we must re-commit every day.
Many artists are addicts, and vice versa. Many are artists in one breath and addicts in another. What's the difference? The addict is the amateur; the artist is the professional.