The Forbidden Sound: What the Monks Were Hiding

A traveler travels to a monastery. They give him food and water and he can sleep inside. Each evening he hears some weird, strange sound.

When he asks a monk about the sound, the monk says: "I can't tell you what causes the sound, because you are not a monk".

The traveler is very curious, so he spends three years in the monastery as a neophyte, chopping wood and carrying water, then he asks the monks about the origin of the sound.
The monk says: "We can't tell you, because you are not a monk"

So the traveler spends another three years as a novice, watering plants and cooking food,then he asks the monks about the origin of the sound.
The monk says: "We can't tell you, because you are not a monk"

So the traveler spends another three years as a initiate, studying religious texts, then he asks the monks about the origin of the sound.
The monk says: "We can't tell you, because you are not a monk"

The traveler spends another three years meditating and praying.

Finally they hold a ceremony when the traveler is ordained to be a monk.

He asks a monk about the origin of the sound.

The monk says: "You are a monk now, go and see."

The monk leads the traveler to a passage.

The passage leads to a big room.

The room leads to another passage.

The passage leads to a small room.

There, the traveler finally sees what is causing the strange sound. But I can't tell you what it is because you are not a monk.