There isn't a hole out there [Augusta] that can't be birdied if you just think. But there isn't one that can't be double-bogeyed if you stop thinking.
As I see it, the thing that hurt my putting most when it was bad, was thinking too much about how I was making the stroke and not enough about getting the ball in the hole.
Some people think they are concentrating when they're merely worrying.
A leading difficulty with the average player is that he totally misunderstands what is meant by concentration. He may think he is concentrating hard when he is merely worrying.
You swing your best when you have the fewest things to think about.