When we are physically and mentally calm, we have the ability to make choices in our lives. Often when we lose control we become physically or emotionally reactive. Not only does being aware of something as simple as breathing tell us a lot about the emotional state of ourselves and others, it gives us the chace to truly observe how and why we react in a certain way to specific circumstances. By anchoring in the present moment with our breath, the benefits of being in the moment are complimented by the natural relaxation that occurs with conscious breathing. Learning to be aware of our breathing is one of the single best tools we have for keeping a foothold in the present moment.
Shannon Duncan, Present Moment Awareness.
We think that happiness is only possible in the future – when we get a house, a car, a Ph.D. We struggle in our mind and body, and we don’t touch the peace and joy that are available right now – the blue sky, the green leaves, the eyes of our beloved.
One of the key, frequent, things in life is having to deal with disappointment. And consequently a lot of our suffering comes from this area, as like this first quote says. We prefer to rerun the memory of an event or a feeling or some words, rather like a dog returning to a bone. A wiser way of acting is suggested in the second quote, staying as close as possible to the felt sense of the experience, thus limiting it spinning off into a reactive cycle of thoughts and emotions. 
Our practice is not to shut everything out; it’s to remain conscious of our environment and what’s happening in it. Then we can deal with it appropriately. We can open the door to our angry thought, listen to it, and then ask it to leave. We recognize it as a thought and don’t mistake it for who we are. That’s the point. It shifts the experience. Instead of thinking, “I’m really angry right now,” we think, “Oh, look, an angry thought has entered my mind.” It’s easy to let go of a thought that’s a guest in your mind; it’s harder when you take on the identity of the guest. 
Mindfulbalance 