Breathing is the connection between the mind and the body. When the mind concentrates on the breath, it focuses attention on the present moment. Breathing is the first step on the path to discover your spiritual nature. As you get the body to breathe correctly, the mind settles down, and that creates fertile ground to develop whatever spiritual nature exists within you.
Unless we are grounded in Mystery -- unless we experience both ourselves and others as co-participants in Mystery -- we find it almost impossible to live in compassionate love of one another for any length of time. Unless we have "new eyes" that can see others contemplatively, it is easy to miss the many-spendored thing that is our life together.