When we speak of silent observation we refer to a way of listening, a way of seeing, which allows the observed its full, unqualified expression. In the process of listening, you may discover that the observer is forever judging, criticizing, comparing and evaluating. This insight alone takes you to a position where you are uninvolved in the perceived. Then a feeling of space opens out between your observing and the observed, eliciting the understanding that the perceived arises in you but you are not limited to anything perceivable. Silence is our real nature.
Then is thought itself the root of the problem?
Thoughts, feelings and sensations are objects of consciousness, and have no existence without the observing subject. Since the perceiver can never be perceived, the moment a thought or perception points back to the perceiver it brings you to silence, to pure being, to consciousness without an object.
Then what is the perceiver?
The perceiver is a faculty, a qualification, which exists the moment there’s a perception in space-time. Without the perception, there is no perceiver either. Both are movements of energy in space-time, and both arise out of and dissolve back into consciousness, which alone is timeless.
The perceiver and the perceived are more or less tools, instruments of consciousness. All that appears is an expression of consciousness.
From The Ease of Being, page 61
You can read more from Jean Klein here.