Some people think they are concentrating when they're merely worrying.
Golf is like eating peanuts. You can play too much or play too little.
One reason golf is such an exasperating game is that a thing we learned is so easily forgotten, and we find ourselves struggling year after year with faults we had discovered and corrected time and again.
The object of golf is to beat someone. Make sure that someone is not yourself.
Many shots are spoiled at the last instant by efforts to add a few more yards.
The 'enemy' in golf is tension.