Why is thinking negation?
As awareness you have identified with a thinking process. This process within itself is a reaction to ones sense of seperation as an individual. It is then that, as consciousness, you are relating from the mind, motivated by a sense of individual contraction. A contraction that is nothing more than an idea of who you think you are.
Consciousness that is realised knows it's no body, it is realised in its truth sense, an absalute consciousness that is indifinable. Relating from this absalute non-personal sense precedes all thinking and idealised personal contraction.
Identifying with thought is a blind reaction to the true movement of what one first is before all conceptual involvement. A reaction that conceals the true action, leeding to distortion, seperation, negation.