It is a truism to say that nobody likes suffering and everybody seeks happiness. In this world of ours, human beings are making all possible efforts for prevention and alleviation off suffering, and enjoyment of happiness. But nevertheless their efforts are mainly directed to the physical well-being by material means.
Happiness is, after all, conditioned by attitudes of mind, and yet only a few persons give real thought to mental development, fewer still who practice mind trading in earnest.
Acknowledging is the heart of insight meditation. It is the continual work of mindfulness to be aware and acknowledge.
Insight meditation, through the four foundations of mindfulness, focuses on the body, the feelings, the mind and objects of the mind.
Practically they are the state of being continually aware of what happens to the five aggregates (which are: body, feelings, perceptions, mental formations and consciousness)
The four foundations of Mindfulness are:
Contemplation of the body
Mindfulness of the body is to contemplate bodily action and sensations. This includes for example acknowledging or being conscious of the lifting, stepping and placing of the feet during walking meditation, and acknowledging the rising an falling of the abdomen in sitting meditation.
Contemplation of the feelings
Mindfulness of one's feelings is to contemplate the happiness/ suffering/neutrality of your experience. That is, to acknowledge happiness, to know how happy one is, or to acknowledge misery, and to know how miserable one is, or to acknowledge the neutral feeling which neither happiness nor misery.
Contemplation of the mind (thought)
Mindfulness of the mind is to contemplate one's thoughts or be conscious of the passion, anger, delusion, sloth, distraction, peace, etc... in the thought. While in meditation our minds may think of the past or the future. We then take that thought as the momentary focus of the meditation by acknowledging thinking, thinking, thinking before returning our focus to the breath or the feet.
Contemplation of objects of the mind
Mindfulness of objects of the mind is to contemplate mental recognition and other volitional activities. Recognition is to know something when perceiving it. Volitional activities happen when we think or comment on something. While we think, we must be mindful of thinking. When we are desirous, angry, slothful, restless or doubtful as a result of thinking of external stimulation, we must be mindful to.