Most of us let our negative emotions persist longer than is necessary. Becoming suddenly angry, we tend to stay angry—and this requires that we actively produce the feeling of anger.
It is a 2014 book by Sam Harris. Harris discusses a wide range of topics including secular spirituality, the illusion of the self, psychedelics, and meditation. He attempts to show that a certain form of spirituality is integral to understanding the nature of the mind.
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The four foundations of mindfulness are the body (breathing, changes in posture, activities), feelings (the senses of pleasantness, unpleasantness, and neutrality), the mind (its moods and attitudes), and the objects of mind (which include the five senses but also other mental states and even mindfulness itself.