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In true competition no person is defeated.
W. Timothy Gallwey • The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance
In other words, the key to better tennis—or better anything—lies in improving the relationship between the conscious teller, Self 1, and the natural capabilities of Self 2.
W. Timothy Gallwey • The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance

Each player tries his hardest to defeat the other, but in this use of competition it isn’t the other person we are defeating; it is simply a matter of overcoming the obstacles he presents.
W. Timothy Gallwey • The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance
Self 1 easily gets enamored of formulas that tell it where the racket should be and when.
W Timothy Gallwey • The Inner Game of Tennis: The classic guide to the mental side of peak performance

Self 2 has very good instincts about when it is time to work on any particular element of your stroke.