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When I meditate thoughts arise and I then become aware that I was thinking but as soon as I become aware the thought is gone. So I am only ever aware of the thought in the past tense. Unless I intentionally think something it does not seem possible to observe random thoughts that arise as they are happening. On retreat one time I was in a state of samadhi and it was like a separate part of my mind knew thought was happening but the thoughts were distant and the part that knew seemed accepting but uninterested in them. It was a very blissful experience. This doesnt happen to me when meditating at home. There are short lived moments of spacious emptiness but never samadhi. At the Sangha I go to the teacher mentioned that when concentration is good then as soon as you become aware of thought it disappears.