These evidence pages show why the observer is treated as a feeling or appearance rather than as a hidden subject behind experience.
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These descriptions attempt to explain concepts that cannot be captured by language alone. While comprehending them intellectually through language may be necessary, it is not sufficient. To appreciate them fully, we must also experience them directly, firsthand, through practice. See also theory vs. practice.
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The observer refers to the feeling of an 'I' or 'self' that separates us from all other experiences. It is the assumed filter or intermediary through which all other appearances are interpreted and understood. In non-dual mindfulness, this idea of a distinct 'observer' is challenged, and in turn is reclassified as a type of appearance, no different in essence than any other.