One of the greatest golfers ever passed away a few years ago. Arnold Palmer was an amazing golfer in his own right. He was also an ambassador for the game.
He once said,
Golf is a game of inches. The most important are the six inches between your ears.
I live this every time I play the game. More often than not I overthink the shot, take too much risk for great reward, play within my means and the list goes on. It is the six inches between my ears that are my biggest enemies.
However, being a student of the game I need to practice the game of inches more and more to get better and better.