Question: Jean Klein says that listening is not a function and that it should be without intention, free from concentration and without any direction as in pure listening there is no objective that we want to achieve.
How would this be different from a person who is stunned or drugged?

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Being drugged is a mind state.
Listening is not a mind state.

A good metaphor is the wide open sky.
Clouds are like mind states in the wide open sky.

JK is talking about the wide open sky and not about the clouds.
The clouds do not affect the wide open sky, no matter if they take the shape of an angel or a dragon.