There is only one categorical ...
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It really is all about believing in yourself: 80 per cent mental, 20 per cent physical.
Victoria Pendleton
Courage - a perfect sensibility of the measure of danger, and a mental willingness to endure it.
William Tecumseh Sherman
Regardless of how you feel inside, always try to look like a winner. Even if you are behind, a sustained look of control and confidence can give you a mental edge that results in victory.
Diane Arbus
Courage is rightly esteemed the first of human qualities... because it is the quality which guarantees all others.
Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.
Quotes from the same author
Excessive golfing dwarfs the intellect. Nor is this to be wondered at when you consider that the more fatuously vacant the mind is, the better for play. It has been observed that absolute idiots play the steadiest.
Charles Walter Simpson
The grounds on which golf is played are called links, being the barren sandy soil from which the sea has retired in recent geological times. In their natural state links are covered with long, rank bent grass and gorse. Links are too barren for cultivation: but sheep, rabbits, geese and professionals pick up a precarious livelihood on them.
Charles Walter Simpson