[DoctorMichael]

"It's not the critic who counts.........It's not the man who points out how the strong man stumbled................Credit belongs to the man who really was in the arena, his face marred by dust, sweat and blood, who strives valiantly, who errs to come short and short again, because there is no effort without error and shortcoming. It is the man who actually strives to do the deeds, who knows the great enthusiasm and knows the great devotion, who spends himself on a worthy cause, who, at best, knows in the end the triumph of great achievement. And who, at worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and cruel souls who know neither victory nor defeat."
~ Teddy Roosevelt
 

[PhilipFreneau]

"It's not the critic who counts.........It's not the man who points out how the strong man stumbled................Credit belongs to the man who really was in the arena, his face marred by dust, sweat and blood, who strives valiantly, who errs to come short and short again, because there is no effort without error and shortcoming. It is the man who actually strives to do the deeds, who knows the great enthusiasm and knows the great devotion, who spends himself on a worthy cause, who, at best, knows in the end the triumph of great achievement. And who, at worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and cruel souls who know neither victory nor defeat."

And, of course, if someone does not possess the talent to be successful in a particular field, he or she could always be a critic (from a Colombo episode).