A plank 12” wide laying on the floor would be easy to walk. Place the same plank between two ten story buildings and “walk the plank” is a different matter. You “see” yourself easily and safely walking the plank on the floor. You “see” yourself falling from the plank stretched between the buildings. Since the mind completes the picture you paint in it, your fears are quite real. Many times a golfer will knock a ball in the lake or hit it out of bounds and then stop back with the comment, “I know I was going to do that.” His mind painted a picture and his body completed the action. On the positive, side, the successful gofer knows that he must ‘see’ the ball going into the cup before he strokes it. A hitter in baseball sees the ball dropping in for a base hit before he swings at the ball, and the successful salesman sees the customer buying before he makes the calls. Michelangelo clearly saw the Mighty Moses in that block of marble before he struck the first blow.
Zig Ziglar, See You at the Top