There is nothing passive about mindfulness. One might even say that it expresses a specific kind of passion—a passion for discerning what is subjectively real in every moment. It is a mode of cognition that is, above all, undistracted, accepting, and (ultimately) nonconceptual. Being mindful is not a matter of thinking more clearly about experience; it is the act of experiencing more clearly, including the arising of thoughts themselves. Mindfulness is a vivid awareness of whatever is appearing in one’s mind or body—thoughts, sensations, moods—without grasping at the pleasant or recoiling from the unpleasant.
Sam Harris, Waking Up: A Guide to Spirituality Without Religion
awareness, experience, mindfulness, spirituality