“Amateurs train until they get it right. Professionals train until they cannot get it wrong.”
“An amateur practices something until he gets it right.A professional practices until he can't get it wrong!”
“The anateur works until they get something right. The professional works until they can't go wrong.”
“I am not a professionally trained professional. I am an amateur professional!”
“An ordinary archer practices until he gets it right. A ranger practices until he never gets it wrong.”
“You can be on the right track and still get hit by a train!”