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The problems which most perplex tennis players are not those deal- ing with the proper way to swing a racket. Books and professionals giving this information abound. Nor do most players complain excessively about physical limitations. The most common com- plaint of sportsmen ringing down the corridors of the ages is, “It’s not that I don’t know what to do, it’s that I don’t do what I know!”

W. Timothy Gallwey, The Inner Game of Tennis, New York, 1974, p. 13

We already know enough to lead perfect lives. […] Our trouble is not ignorance, but inaction.

Dale Carnegie, How to stop worrying and start living, New York, 1984, p. xvii