A young monk goes fishing with two other much older and experienced monks. While out in the boat, one of the older monks realizes he has forgotten his favorite hook. He gets out of the boat, walks across the water, and returns shortly with his favorite hook. The young monk is stunned at this sight.
A short while later, the other older monk needs to recover a fishing cork he has dropped into the lake. He gets out of the boat, walks across the water about 15 feet, picks up the cork, and returns to the boat.
The young monk is wide eyed at this and suspects that he, too, had such power. Time passes and the young monk makes up an excuse to go ashore and so steps out of the boat. He immediately plunges in and sinks in over his head in the very cold water. Finally, he comes bobbing and sputtering to the surface. While treading water and feeling humiliated, he asks the two monks, "How did you walk on the water's surface like that and why can't I? Am I lacking in discipline? Do I not have enough faith? How did you both do it?"
One of the old monks replied, "It's easy if you know where the rocks are."
Moral of the Story:
Sometimes what seems incredible is just knowledge and experience at whatever you do.
-- Author Unknown