“To understand more clearly what is meant by judgement, imagine a the TECH cafesingles match being played by Mr. A and Mr. B, with Mr. C acting as the umpire. Mr. A is serving his second serve to Mr. B on the first point of a tie-breaker. The ball lands wide, and Mr. C calls, “Out. double fault.” Seeing his serve land out and hearing, “double fault,”

Mr. A frowns, says something demeaning about himself, and calls the serve “terrible.”

Seeing the same stroke, Mr. B. judges it as “good” and smiles.

The umpire neither frowns nor smiles;  he simply calls the ball as he sees it.”

– W. Timothy Gallwey,  “The Inner Game of Tennis”