Beside the old country road, off to the side by a few dozen meters, stood an old monastery. It had been there for as long as any resident could remember. And inside lived a group of monks. These monks mostly kept to themselves, although they were very kind and would help travelers if they needed it.
    One day, a man's car broke down on the side of the road near the monastery. He tried to get it to start, then decided it was useless and abandoned the attempt. Thankfully it had started sputtering a few seconds before it collapsed, and he had managed to pull over off the road. Being stuck until he could get help the next day, he decided to spend the night at the monastery where he knew the monks would help him.
    During the night, as he lay in his bed, he heard a loud scratching and thumping noise coming from the floor above him. It went on for so long that he could barely sleep. In the morning, he asked the monks what it was before he left. They exchanged glances and said, "That is an important matter, and we cannot tell you because you are not a monk."
    A few years later, the man was in the same situation. He was driving down the same road when his very unreliable car broke down again. He was a bit embarrassed as he asked the monks for help again, but they waved it off. 
    While in his bed, he again heard the loud scratching and thumping. When asking the monks in the morning, their response was the same. So the man asked the monks, "What can I do to become a monk?"
    "Travel throughout the world and cut every blade of grass and overturn every pebble," the monks said. So he set out to do just that.
    46 years later, an old, gray-haired man with a back bent from years spent cutting grass and turning over pebbles hobbled into the monastery. "I have done it!" he croaked. "Well done," the monks said. "Now that you are a monk, we will show you the great secret that is in the room above where you slept."
    So they led him to that room. It had a small wooden door. After opening it, he found a stone door. Inside that was a copper door. Then a bronze door. Then an iron door. At this point he was quite far into this strange hallway and he looked back and asked the monks, "Is this safe?" The monks just nodded and smiled. He kept going. A steel door. Finally he found doors made of precious metals. A silver door. A gold door. An emerald door. A ruby door. A sapphire door. Finally, the diamond door. This was semi-clear and he could tell it was the last one. He opened it and saw....

    But I can't tell you what he saw, because you are not a monk.